TDA1302T [NXP]
Data amplifier and laser supply circuit for CD player and read only optical systems; 数据放大器和CD播放机的激光电源电路和只读光学系统
| 型号： | TDA1302T |
| 厂家： | 
NXP |
| 描述： | Data amplifier and laser supply circuit for CD player and read only optical systems |
| 文件： | 总18页 (文件大小：522K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TDA1302_1 2 Wed Sep 14 13:30:56 1994
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
FEATURES
GENERAL DESCRIPTION
• Six input buffer amplifiers with low-pass filtering and with
virtually no offset
The TDA1302T is a data amplifier and laser supply circuit
for three-beam pick-up detectors applied in a wide range
of mechanisms for Compact Disc and read only optical
systems. The device contains 6 amplifiers which amplify
and filter the focus and radial diode signals and provides
an equalized RF signal suitable for single or double speed
mode; the mode can be switched by means of the speed
control pin. The device can accommodate astigmatic,
single foucault and double foucault detectors and can be
applied to all N-sub laser/monitor diode units even though
the circuit has been optimized for the Philips CDM12
mechanisms and the digital servo controller TDA1301T.
After a single initial adjustment the circuit will maintain
control over the laser diode current thus resulting in a
constant light output power which is independent of
ageing. The IC is mounted in a small-outline package to
enable it to be mounted close to the laser pick-up unit on
the sledge.
• HF data amplifier with a high or low gain mode
• Two built-in equalizers for single or double-speed mode
ensuring high performance in both modes
• Fully automatic laser control including stabilization and
an ON/OFF switch, plus a separate supply (VDDL) for
power reduction
• Adjustable laser bandwidth and laser switch-on current
slope
• Protection circuit to prevent laser damage due to supply
voltage dip
• Optimized interconnectiion between pick-up detector
and digital servo processor (TDA1301T)
• Wide supply voltage range
• Wide temperature range
• Low power consumption.
QUICK REFERENCE DATA
SYMBOL
VDD
PARAMETER
CONDITIONS
MIN.
3.4
TYP.
MAX.
5.5
UNIT
supply voltage (pin 18)
−
V
Diode current amplifiers
Gdn
Ios(d)
B
amplification
−
1.55
−
−
dB
diode output offset current
3 dB bandwidth
−
100
−
nA
Ii(d) = 1.67 µA
50
−
kHz
RFE amplifier (built-in equalizer)
td(eq)
td(f)
equalization delay
flatness delay
fi = 0.3 MHz
−
−
320
5
−
−
ns
ns
double-speed
Laser supply
Io(l)
output current
VDDL = 3 V
−
−
−100
mA
ORDERING INFORMATION
TYPE NUMBER
PACKAGE
DESCRIPTION
plastic small outline package; 24 leads; body width 7.5 mm
NAME
VERSION
TDA1302T
SO24
SOT137-1
September 1994
2
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
SCHEMATIC DIAGRAM
September 1994
3
TDA1302_1 4 Wed Sep 14 13:30:56 1994
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
BLOCK DIAGRAM
Fig.2 Block diagram.
September 1994
4
TDA1302_1 5 Wed Sep 14 13:30:56 1994
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
PINNING
SYMBOL
O4
PIN
DESCRIPTION
1
2
3
4
5
6
7
output of diode current amplifier 4
output of diode current amplifier 6
output of diode current amplifier 3
output of diode current amplifier 1
output of diode current amplifier 5
output of diode current amplifier 2
O6
O3
O1
O5
O2
LDON
control pin for switching the laser
ON and OFF
VDDL
RFE
8
9
laser supply voltage
equalized output voltage of sum
signal of amplifiers 1 to 4
RF
HG
LS
10
11
12
13
14
unequalized output
control pin for gain switch
control pin for speed switch
external capacitor
CL
ADJ
reference input normally
connected to ground via a resistor
GND
15
0 V supply; substrate connection
(ground)
LO
MI
VDD
I2
16
17
18
19
20
21
22
23
24
current output to the laser diode
laser monitor diode input
amplifier supply voltage
photo detector input 2 (central)
photo detector input 5 (satellite)
photo detector input 1 (central)
photo detector input 3 (central)
photo detector input 6 (satellite)
photo detector input 4 (central)
I5
I1
I3
I6
Fig.3 Pin configuration.
I4
September 1994
5
TDA1302_1 6 Wed Sep 14 13:30:56 1994
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
The third part is the power output stage, its input being the
integrator output signal. This stage has a separate supply
voltage (VDDL) thereby offering the possibility of reduced
power consumption by supplying this pin with the minimum
voltage necessary.
FUNCTIONAL DESCRIPTION
The TDA1302T can be divided into two main sections, the
laser control circuit and the photo diode signal filter and
amplification section.
It also has a laser diode protection circuit which is enabled
prior to the output drive transistor becoming saturated due
to a large voltage dip on VDDL. Saturation will result in a
lower current from the laser diode, which is normally
followed immediately by an increment of the voltage from
the external capacitor CL, which could cause damage to
the laser diode at the end of the voltage dip. The protection
circuit prevents an increment of the capacitor voltage and
thus offers full protection to the laser diode under these
circumstances.
Laser control circuit
The main function of the laser control circuit is to control
the laser diode current in order to achieve a constant light
output power which is based on the current of the monitor
diode which is continuously monitored. The circuit is built
up into three parts.
The first part is the input stage which compares the
monitor diode current with a current which is 10 times the
value of the adjustable current. The adjustable current is
derived from a bandgap reference source, to be
temperature independent, and can be further adjusted by
the external resistor RADJ in order to adapt the circuit to the
parameters of the laser/monitor diode unit to be used. The
difference is fed to the second part.
Photo diode signal filter and amplification section
This section has 6 identical current amplifiers. Amplifiers 1
to 4 are designed to amplify the focus photo diode signals.
Each amplifier has two outputs, an LF output and an
internal RF output. Amplifiers 5 and 6 are used for the
radial photo diode currents and have only an LF output. All
6 output signals are low-pass filtered with a corner
frequency at 65 kHz. The internal RF output signals are
summed together and converted into a voltage by means
of a selectable transresistance of 120 kΩ or 240 kΩ. This
signal is available directly at pin 10, however, there is also
an unfiltered signal available at pin 9. The equalization
filter used has 2 different filter curves, one for single-speed
mode and one for double-speed mode.
The second part is the integrator stage which makes use
of an external capacitor CL. This capacitor has two
different functions.
During switch-on of the laser current, it provides a current
slope of typically: dILO/dt 10−6/CL (A/s).
After switch-on it ensures that the bandwidth conforms to
the typical formula: fB K × Aext × 90−9/(CL × IMON) (Hz).
where Aext represents the AC gain of an extra loop
amplifier, if applied, and K = dImonitor/dIlaser which is
determined by the laser/monitor unit.
IMON is the average current (pin 17) at typical light
emission power of the laser diode.
Table 1 Operational modes.
MODE(1)
IF NOT
GAIN
SPEED
LASER
OFF
SWITCH
PIN
CONNECTED
DEFAULT
HIGH
LOW
SINGLE
DOUBLE
ON
HG
Control pin LS
LDON
1
1
1
1
X
X
0
X
X
X
1
X
0
X
X
1
X
X
0
X
X
Note
1. Where X = don’t care.
September 1994
6
TDA1302_1 7 Wed Sep 14 13:30:56 1994
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
VDD
PARAMETER
MIN.
MAX.
UNIT
supply voltage
−
−
8.0
V
Ptot
total power dissipation
storage temperature
300
mW
°C
°C
Tstg
Tamb
−65
−40
+150
+85
operating ambient temperature
HANDLING
Classification A: human body model; C = 100 pF; R = 1500 Ω; V = ± 2000 V.
Charge device model: C = 200 pF; L = 2.5 µH; R = 0 Ω; V = 250 V.
THERMAL RESISTANCE
SYMBOL
PARAMETER
THERMAL RESISTANCE
Rth j-a
from junction to ambient in free air
60 K/W
QUALITY SPECIFICATION
In accordance with “SNW-FQ-611 part E”. The numbers of the quality specification can be found in the “Quality
Reference Handbook”. The handbook can be ordered using the code 9398 510 63011.
CHARACTERISTICS
VDD = 3.4 V; VDDL = 2.5 V; Tamb = 25 °C; RADJ = 48 kΩ; HG = logic 1; LS = logic 1; with an external LP filter
(Rext = 750 Ω, Cext = 47 pF) at pin 9; unless otherwise specified.
SYMBOL
Supply
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
IDD
amplifier supply current
amplifier supply voltage
laser control supply voltage
power dissipation
laser OFF
−
8
−
mA
VDD
VDDL
Pdiss
3.4
2.5
−
−
5.5
5.5
−
V
−
V
laser OFF; VDD = 3.4 V
27
mW
Diode current amplifiers (1 to 6)
Ii(d)
diode input current
equivalent noise input
diode input voltage
diode output voltage
amplification
note 1
−
−
10
−
µA
Neq
Vi(d)
Vo(d)
Gdn
−
1
pA/√Hz
Ii(d) = 1.67 µA
−
0.9
−
−
V
−0.2
1.43
V
DD − 1
V
Ii(d) = 1.67 µA;
1.55
1.67
dB
Vo(dn) = 0 V; note 2
Ios(d)
Zo(d)
B
diode output offset current
output impedance
Icsin = Itsin = 0; note 3
−
−
100
−
nA
kΩ
kHz
%
Idi = 1.67 µA; Vo(dn) = 0 V 500
−
3 dB bandwidth
Ii(d) = 1.67 µA
50
68
−
−
Gmm
mismatch in amplification
Idi = 1.67 µA;
−
3
Vo(dn) = Vo(dm)
September 1994
7
TDA1302_1 8 Wed Sep 14 13:30:56 1994
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Data amplifier; equalized single and double speed
VRFO
RRF
DC output voltage
transresistance
Icsin = 0
−
0.3
−
V
fi = 100 kHz; note 4
fi = 100 kHz; note 5
note 6
100
200
−
120
240
−
143
285
kΩ
kΩ
V
VRFMO
SRRF
ZoRF
td(eq)
td(f)
output voltage
slew rate
V
−
−
−
−
−
−
DD − 1.2
VSR = 1 V (p-p)
fi = 1 MHz
−
6
V/µs
Ω
output impedance
equalization delay
flatness delay (Φ/ω)
gain ratio
−
100
320
10.5
6
note 7
−
ns
LS = 1 or 0; notes 7 and 8
note 8
−
ns
GR
4.5
3
dB
MHz
BRF
unequalized output bandwidth Ii(d) = 1.67 µA
5
Control pins LDON, LS and HG (with 47 kΩ internal pull-up resistor)
VIL
VIH
IIL
LOW level input voltage
HIGH level input voltage
LOW level input current
−0.2
−
−
−
+0.5
V
VDD − 1
V
DD + 0.2
V
−
100
µA
Laser output
Vo(l)
Io(l)
output voltage
output current
Io(l) = 100 mA
−0.2
−
−
V
DD − 0.7
V
−
−100
mA
Monitor diode input
Vi(mon
)
monitor input voltage
monitor input current
Ii(mon) = −1 mA
−
−
V
DD − 0.7
−
V
Ii(mon)
−
2
mA
Reference source VGAP and laser adjustment current IADJ
Vref
∆T
reference voltage
RADJ = 48 kΩ
RADJ = 48 kΩ
1.15
−
1.24
40 × 10−6
1.31
−
V
reference temperature drift
reference supply rejection
adjustment current
SRref
IADJ
Zi
−
−
1
%
RADJ = 5.6 kΩ
RADJ = 48 kΩ
CL = 1 nF
−
−
200
−
µA
input impedance
−
1
kΩ
dlo(l)/dt
M
slew rate output current
multiplying factor (Ii(mon)/IADJ
−
1
−
mA/µs
)
−
10
−
September 1994
8
TDA1302_1 9 Wed Sep 14 13:30:56 1994
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
Notes to the characteristics
1. The maximum input current is defined as the current in which the gain reaches its minimum. Increasing the supply
voltage to VDD = 5 V increases the maximum input current (see also Figs 4 and 5).
2. The gain increases if a larger supply voltage is used (see also Fig.6).
3. Icsin is the sum of the diode input currents 1 to 4; Itsin is the sum of the diode input currents 5 and 6.
4. Transresistance 120 kΩ means LOW gain, selected if HG = logic 0 (see Table 1).
5. Transresistance 240 kΩ means HIGH gain, selected if HG = logic 1 (see Table 1).
6. Output voltage swing will be: VSRRF = VRFMO = VRFO(p-p)
.
7. Refers to equalized output only.
8. For single speed the gain ratio is defined as gain difference between 1 MHz and 100 kHz, while the flatness delay
is defined up to 1 MHz (see also Fig.7). For double speed the gain ratio is defined as gain difference between 2 MHz
and 200 kHz, while the flatness delay is defined up to 2 MHz.
Transfer function
The equalized amplifier including Cext and Rext has the following transfer functions, where ‘rfe’ refers to equalized output
only and ‘rf’ refers to equalized and not equalized outputs.
FOR SINGLE SPEED (SP = LOGIC 1)
1 – ks2 ⁄ ω2
1 + 1 ⁄ Q × s ⁄ ωos + s2 ⁄ ω2
Vrfe
1
1
os
= Rrf × ------------------------------------------------------------------------ ×
×
(1)
(2)
---------------------- -----------------------------------------
---------
1 + s ⁄ ω1 1 + sRext × Cext
Icsin
os
FOR DOUBLE SPEED (SP = LOGIC 0)
1 – ks2 ⁄ ω2
1 + 1 ⁄ Q × s ⁄ ωod + s2 ⁄ ω2
Vrfe
1
os
= Rrf × ------------------------------------------------------------------------ ×
-----------------------------------------
1 + sRext × Cext
---------
Icsin
od
The denominator forms the denominator of a Bessel low-pass filter.
Table 2 Transresistance.
SYMBOL
DESCRIPTION
internally defined
TYP.
UNIT
k
4
ωos/ω1 = ωod/ω2
internally defined
1.094
0.691
Q
internally defined
ωod = 2 × ωos
RRF
internally defined
17.6 × 10−6
rad/s
see Chapter “Characteristics”
external resistor
−
Rext
750
47
Ω
Cext
external capacitor
pF
September 1994
9
TDA1302_1 10 Wed Sep 14 13:30:56 1994
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
V
V
↑ = test limit.
Fig.4 Maximum input current as a function of VDD
.
→ = test limit.
Fig.5 Output current as a function of input current.
10
September 1994
TDA1302_1 11 Wed Sep 14 13:30:56 1994
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
I
↓
= test limit.
Fig.6 Gain as a function of VDD
.
The dashed line = delay (ns); the solid line = gain (dB).
Fig.7 Transfer for single speed.
11
September 1994
TDA1302_1 12 Wed Sep 14 13:30:56 1994
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
INTERNAL PIN CONFIGURATION
Fig.8 Equivalent internal pin diagrams.
September 1994
12
TDA1302_1 13 Wed Sep 14 13:30:56 1994
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
is optimized for this type, besides the standard
APPLICATION INFORMATION
components CL and RADJ, no other external components
are required as illustrated in Fig.9.
The TDA 1302T is optimized for Philips CDM12
mechanisms and, subsequently, this application is
preferred.
As two central spot diodes are summed together inside the
pick-up unit, one input pin remains unused as shown in
Fig.10. Unused central spot inputs should be connected to
ground in order to eliminate noise contribution to the RF
and RFE signals.
Application with Philips CDM12
The CDM12 mechanism uses an N sub-laser diode
together with a P sub-monitor diode and, since TDA1302T
Fig.9 Application of the CDM12 laser/monitor diode unit.
Fig.10 Application of the CDM12 pick-up unit.
13
September 1994
TDA1302_1 14 Wed Sep 14 13:30:56 1994
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
Application of other mechanisms
Table 3 Pick-up units.
The TDA1302T can accommodate all laser/monitor
configurations with an N sub-laser diode. When an N
sub-monitor diode is used, external circuitry is required as
illustrated in Figs 11(a) to 11(d). Most of these
laser/monitor diode units have a variable resistor (Rm) in
parallel with the monitor diode which has been
pre-adjusted so that the voltage drop across this resistor
has a specific value at nominal laser diode output power.
The four circuits given each detail specific values for some
frequently used pick-up units as given in Table 3. Each
circuit has its own advantages. All circuits illustrated make
use of the fixed voltage (<200 mV) across the built-in
monitor resistor.
PICK-UP
UNIT
MANUFACTURER
APPLICATION
SLD104U
LT022MS
Sony corporation
Sharp corporation
KSM210 (Sony)
KSM210 (Sony)
KSM210 (Sony)
RLD-78MA Rohm corporation
HOP-M3TR
(Hitachi)
SF91
Sony corporation
CDV90V1 (Sanyo)
Fig.11 Applications of the laser/monitor units.
14
September 1994
TDA1302_1 15 Wed Sep 14 13:30:56 1994
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
In Figs 11(b) to 11(d) solutions have been given requiring
no adjustment. RADJ and Re can be calculated as follows:
PROPERTIES OF CIRCUIT FIG.11(a)
It is important that the Vd(D1) approaches Vbe(T1) at
RADJ = 12.4Re/VRm at Po(nom)
.
approximately 150 µA, that is why a small diode has been
applied such as the BA482. Additional adjustment may be
necessary. this depends on the matching of Vd(D1) and
Vbe(T1) and the permitted tolerance on the laser current.
The advised adjustment procedure is as follows:
Examples of advised values applicable to Fig.11(b), (c)
and (d) are given in Table 6.
Table 6 Advised circuit values.
1. Ensure that RADJ has the highest impedance at the
beginning of the adjustment.
PICK-UP
UNIT
MANUFACTURER Re (Ω) RADJ (kΩ)
2. Adjust RADJ until the voltage across Rm has the value
as indicated in Table 4.
SLD104U
LT022MS
RLD-78MA
SF90
Sony corporation
Sharp corporation
Rohm corporation
Sanyo corporation
Sanyo corporation
620
620
620
750
750
51
51
51
51
51
Table 4 Variable resistor (Rm) voltage adjustment.
PICK-UP UNIT
SLD104U
LT022MS
RLD-78MA
SF90
MANUFACTURER
Sony corporation
Sharp corporation
Rohm corporation
Sanyo corporation
Sanyo corporation
VRm (mV)
150
SF91(1)
Note
150
1. Notwithstanding that the SF91 specification details an
astigmatic detection system, TDA1301T requires a
single Foucault parameter setting.
150
180
SF91
180
Figures 12 and 13 give the application diagrams of the
pick-up unit of the mechanisms as previously indicated.
Table 5 Further circuit properties of Fig.11.
FIGURE
PROPERTIES
single supply voltage
only a few components are required;
2R, 1T and 1D
(a)
supply voltage independent
single supply voltage
only a few components are required;
1R, 2T and 1D
(b)
supply voltage independent
no extra adjustment necessary if T1 and T2
match
only a few components are required;
1R and 2T
supply voltage independent
no extra adjustment necessary
better power efficiency than (b)
single supply voltage
(c)
(d)
supply voltage independent
no extra adjustment necessary
no matching components required
September 1994
15
TDA1302_1 16 Wed Sep 14 13:30:56 1994
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
Fig.12 Application of pick-up units SLD104U, LT022MS and RLD-78MA.
Fig.13 Application of pick-up unit SF91.
16
September 1994
TDA1302_1 17 Wed Sep 14 13:30:56 1994
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
Circuit recommendations
PRINTED-CIRCUIT BOARD LAY-OUT ITEMS
It is advised to keep the output wires of the diode current
amplifiers separated from the input as much as possible to
prevent oscillations.
EXTERNAL MONITOR DIODE CIRCUITRY
TDA1302T protects the laser diode against damage due to
supply voltage transients. When any external circuitry is
used in the ‘laser diode-monitor diode’ chain, the safety of
the laser diode completely relies on the quality of this
external circuitry. Therefore, it should be noted that:
1. If such a circuit requires a supply voltage, make sure
that this voltage is present at least at the same
moment as VDDL or earlier.
2. It is advised not to implement integrating actions in this
external circuitry as this may conflict with the internal
integrator, especially during possible supply voltage
drops.
MEASUREMENT OF THE LASER DIODE CURRENT
It is advised not to connect any current meter directly in
series with the laser diode. A safe method is the inclusion
of a 1 Ω resistor, connected in series with the laser diode,
and measuring the voltage across this resistor.
September 1994
17
TDA1302_1 18 Wed Sep 14 13:30:56 1994
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
PACKAGE OUTLINE
15.6
15.2
7.6
7.4
A
10.65
10.00
0.1 S
S
0.9
0.4
(4x)
24
13
1.1
1.0
2.45
2.25
2.65
0.3
0.1
0.32
2.35
0.23
pin 1
index
1.1
0.5
o
0 to 8
1
12
detail A
MBC235 - 1
0.49
0.36
0.25
M
1.27
(24x)
Dimensions in mm.
Fig.14 Plastic small outline package; 24 leads; body width 7.5 mm (SO24L; SOT137AH).
September 1994
18
TDA1302_1 19 Wed Sep 14 13:30:56 1994
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
applied to the substrate by screen printing, stencilling or
pressure-syringe dispensing before device placement.
SOLDERING
Plastic small-outline packages
BY WAVE
Several techniques exist for reflowing; for example,
thermal conduction by heated belt, infrared, and
vapour-phase reflow. Dwell times vary between 50 and
300 s according to method. Typical reflow temperatures
range from 215 to 250 °C.
During placement and before soldering, the component
must be fixed with a droplet of adhesive. After curing the
adhesive, the component can be soldered. The adhesive
can be applied by screen printing, pin transfer or syringe
dispensing.
Preheating is necessary to dry the paste and evaporate
the binding agent. Preheating duration: 45 min at 45 °C.
Maximum permissible solder temperature is 260 °C, and
maximum duration of package immersion in solder bath is
10 s, if allowed to cool to less than 150 °C within 6 s.
Typical dwell time is 4 s at 250 °C.
REPAIRING SOLDERED JOINTS (BY HAND-HELD SOLDERING
IRON OR PULSE-HEATED SOLDER TOOL)
Fix the component by first soldering two, diagonally
opposite, end pins. Apply the heating tool to the flat part of
the pin only. Contact time must be limited to 10 s at up to
300 °C. When using proper tools, all other pins can be
soldered in one operation within 2 to 5 s at between 270
and 320 °C. (Pulse-heated soldering is not recommended
for SO packages.)
A modified wave soldering technique is recommended
using two solder waves (dual-wave), in which a turbulent
wave with high upward pressure is followed by a smooth
laminar wave. Using a mildly-activated flux eliminates the
need for removal of corrosive residues in most
applications.
For pulse-heated solder tool (resistance) soldering of VSO
packages, solder is applied to the substrate by dipping or
by an extra thick tin/lead plating before package
placement.
BY SOLDER PASTE REFLOW
Reflow soldering requires the solder paste (a suspension
of fine solder particles, flux and binding agent) to be
DEFINITIONS
Data sheet status
Objective specification
Preliminary specification
Product specification
This data sheet contains target or goal specifications for product development.
This data sheet contains preliminary data; supplementary data may be published later.
This data sheet contains final product specifications.
Limiting values
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information
Where application information is given, it is advisory and does not form part of the specification.
LIFE SUPPORT APPLICATIONS
These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.
September 1994
19
相关型号：
TDA1305TD
IC SERIAL INPUT LOADING, 0.1 us SETTLING TIME, 20-BIT DAC, PDSO28, Digital to Analog Converter
NXP
©2020 ICPDF网 联系我们和版权申明