VCA2614Y/2K [BB]
Dual, VARIABLE GAIN AMPLIFIER with Input Buffer; 双可变增益放大器，具有输入缓冲器
| 型号： | VCA2614Y/2K |
| 厂家： | 
BURR-BROWN CORPORATION |
| 描述： | Dual, VARIABLE GAIN AMPLIFIER with Input Buffer |
| 文件： | 总15页 (文件大小：289K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
VCA2614
V
C
A
2
6
1
4
SBOS185D – JANUARY 2001 – REVISED MARCH 2003
Dual, VARIABLE GAIN AMPLIFIER
with Input Buffer
FEATURES
● GAIN RANGE: 40dB
DESCRIPTION
The VCA2614 is a highly integrated, dual receive channel,
Variable Gain Amplifier (VGA) with analog gain control.
● 40MHz BANDWIDTH
The VCA2614’s VGA section consists of two parts: the Volt-
age Controlled Attenuator (VCA) and the Programmable Gain
Amplifier (PGA). The gain and gain range of the PGA can be
digitally programmed. The combination of these two program-
mable elements results in a variable gain ranging from 0dB up
to a maximum gain as defined by the user through external
connections. The single-ended unity gain input buffer provides
predictable high input impedance. The output of the VGA can
be used in either a single-ended or differential mode to drive
high-performance Analog-to-Digital Converters (ADCs). A sepa-
rate power-down pin reduces power consumption.
● LOW CROSSTALK: 70dB at Max Gain, 5MHz
● HIGH-SPEED VARIABLE GAIN ADJUST
● POWER SHUTDOWN MODE
● HIGH IMPEDANCE INPUT BUFFER
APPLICATIONS
● ULTRASOUND SYSTEMS
● GAMMA CAMERAS
● WIRELESS RECEIVERS
● TEST EQUIPMENT
The VCA2614 also features low crosstalk and outstanding
distortion performance. The combination of low noise and gain
range programmability makes the VCA2614 a versatile build-
ing block in a number of applications where noise perfor-
mance is critical. The VCA2614 is available in a TQFP-32
package.
CP2A
CP1A
VCA2614
(1 of 2 Channels)
NOUTA
Voltage
Control
Attenuator
Programmable
Gain Amplifier
Buffer
INA
POUTA
MGS1
Maximum
Gain Select
MGS3
Analog
Control
Maximum Gain
MGS2
VCACNTL
Select
NOUTB
Voltage
Control
Attenuator
Programmable
Gain Amplifier
Buffer
INB
POUTB
CP2B
CP1B
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 2001-2003, Texas Instruments Incorporated
www.ti.com
ABSOLUTE MAXIMUM RATINGS(1)
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru-
ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
Power Supply (+VS) ............................................................................. +6V
Analog Input ............................................................. –0.3V to (+VS + 0.3V)
Logic Input ............................................................... –0.3V to (+VS + 0.3V)
Case Temperature ......................................................................... +100°C
Junction Temperature .................................................................... +150°C
Storage Temperature ...................................................... –40°C to +150°C
NOTE: (1) Stresses above those listed under “Absolute Maximum Ratings”
may cause permanent damage to the device. Exposure to absolute maximum
conditions for extended periods may affect device reliability.
ESD damage can range from subtle performance degrada-
tion to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.
PACKAGE/ORDERING INFORMATION
SPECIFIED
PACKAGE
DESIGNATOR(1)
TEMPERATURE
RANGE
PACKAGE
MARKING
ORDERING
NUMBER
TRANSPORT
MEDIA, QUANTITY
PRODUCT
PACKAGE-LEAD
VCA2614Y
TQFP-32 Surface-Mount
PBS
–40°C to +85°C
VCA2614Y
VCA2614Y/250
VCA2614Y/2K
Tape and Reel, 250
Tape and Reel, 2000
"
"
"
"
"
NOTE: (1) For the most current specifications and package information, refer to our web site at www.ti.com.
ELECTRICAL CHARACTERISTICS
At TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground differential output (2Vp-p), MGS = 011, and fIN = 5MHz, unless otherwise noted.
VCA2614Y
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
BUFFER
Input Resistance
600
5
kΩ
pF
Input Capacitance
Input Bias Current
Maximum Input Voltage
Input Voltage Noise
Input Current Noise
Noise Figure
1
nA
1
Vp-p
√Hz
MGS = 111, PGA Gain = 44.2dB, RS = 50Ω
Independent of Gain
4.8
350
13
100
nV/
√Hz
fA/
dB
RF = 550Ω, PGA Gain = 44.2dB, RS = 75Ω
Bandwidth
MHz
PROGRAMMABLE VARIABLE GAIN AMPLIFIER
Peak Input Voltage
1
40
Vp-p
MHz
V/µs
V
–3dB Bandwidth
Slew Rate
300
Output Signal Range
RL ≥ 500Ω Each Side to Ground
2.5 ±1
1
Output Impedance
f = 5MHz
Ω
Output Short-Circuit Current
±40
mA
dBc
dBc
dB
3rd-Harmonic Distortion
2nd-Harmonic Distortion
Overload Performance (2nd-Harmonic
Distortion)
f = 5MHz, VOUT = 2Vp-p, VCACNTL = 3.0V
f = 5MHz, VOUT = 2Vp-p, VCACNTL = 3.0V
Input Signal = 1Vp-p, MGS = 111, VCACNTL = 2V
–45
–45
–60
–50
–40 to –45
Time Delay
5
ns
dBc
dB
IMD, 2-Tone
VOUT = 2Vp-p, f = 9.95MHz
–59
70
Crosstalk
Group Delay Variation
1MHz < f < 10MHz, Full Gain Range
13
ns
ACCURACY
Gain Slope
10.5
dB/V
dB
Gain Error
±2(1)
Output Offset Voltage
±50
mV
GAIN CONTROL INTERFACE
Input Voltage (VCACNTL) Range
Input Resistance
0.2 to 3.0
V
1
MΩ
µs
Response Time
40dB Gain Change, MGS = 111
Operating, Each Channel
0.2
POWER SUPPLY
Specified Operating Range
Power Dissipation
Power-Down
4.75
5.0
120
9.2
5.25
150
V
mW
mW
NOTE: (1) Referenced to best fit dB-linear curve.
VCA2614
2
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SBOS185D
PIN CONFIGURATION
Top View
TQFP
+INA
NC
1
2
3
4
5
6
7
8
24 VCACNTL
23 MGS3
22 MGS2
21 MGS1
20 PD
VDDR
VBIAS
VCM
VCA2614
GNDR
NC
19 NC
18 NC
+INB
17 DNC
PIN DESCRIPTIONS
PIN
DESIGNATOR
DESCRIPTION
PIN
DESIGNATOR
DESCRIPTION
1
2
+INA
NC
Input Channel A
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
DNC
NC
Do Not Connect
No Internal Connection
Internal Reference Supply
Bias Voltage
No Internal Connection
3
VDDR
VBIAS
VCM
NC
No Internal Connection
4
PD
Power Down (Active LOW)
Maximum Gain Select 1 (MSB)
Maximum Gain Select 2
Maximum Gain Select 3 (LSB)
VCA Analog Control
5
Common-Mode Voltage
Internal Reference Ground
No Internal Connection
Input Channel B
MGS1
MGS2
MGS3
VCACNTL
NOUTA
POUTA
GNDA
VDDA
CP1A
6
GNDR
NC
7
8
+INB
NC
9
No Internal Connection
Do Not Connect
Negative VCA Output Channel A
Positive VCA Output Channel A
Ground Channel A
10
11
12
13
14
15
16
DNC
CP2B
CP1B
VDDB
GNDB
POUTB
NOUTB
Coupling Capacitor Channel B
Coupling Capacitor Channel B
+5V Supply Channel B
Ground Channel B
+5V Supply Channel A
Coupling Capacitor Channel A
Coupling Capacitor Channel A
Do Not Connect
CP2A
Positive Output Channel B
Negative Output Channel B
DNC
NC
No Internal Connection
VCA2614
SBOS185D
3
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TYPICAL CHARACTERISTICS
At TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground, differential output (2Vp-p) MGS = 011, and fIN = 5MHz, unless otherwise noted.
GAIN vs VCACNTL
GAIN ERROR vs TEMPERATURE
50
45
40
35
30
25
20
15
10
5
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
VCACNTL (V)
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
VCACNTL (V)
GAIN ERROR vs VCACNTL
GAIN ERROR vs VCACNTL
2.0
1.5
2.0
1.5
1.0
1.0
0.5
0.5
0
0
–0.5
–1.0
–1.5
–2.0
–0.5
–1.0
–1.5
–2.0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
VCACNTL (V)
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
VCACNTL (V)
GAIN MATCH: CHA to CHB, VCACNTL = 0.2V
GAIN MATCH: CHA to CHB, VCACNTL = 3.0V
120
100
80
60
40
20
0
80
70
60
50
40
30
20
10
0
Delta Gain (dB)
Delta Gain (dB)
VCA2614
4
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SBOS185D
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground, differential output (2Vp-p) MGS = 011, and fIN = 5MHz, unless otherwise noted.
GAIN vs FREQUENCY
(VCACNTL = 3.0V)
GAIN vs FREQUENCY
50
45
40
35
30
25
20
15
10
5
35
30
25
20
15
10
5
VCACNTL = 3.0V
MGS = 111
MGS = 011
VCACNTL = 1.6V
VCACNTL = 0.2V
0
MGS = 001
–5
–10
–15
0
100k
1M
10M
100M
100k
1M
10M
100M
Frequency (Hz)
Frequency (Hz)
INPUT REFERRED NOISE vs VCACNTL
OUTPUT REFERRED NOISE vs VCACNTL
220
200
180
160
140
120
100
80
450
400
350
300
250
200
150
100
50
60
40
20
0
0
0
0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
VCACNTL (V)
0
0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
VCACNTL (V)
NOISE FIGURE vs RS
INPUT REFERRED NOISE vs RS
24
22
20
18
16
14
12
10
8
100
10
1
6
4
2
10
100
1k
1
10
100
1k
RS (Ω)
RS (Ω)
VCA2614
SBOS185D
5
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TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground, differential output (2Vp-p) MGS = 011, and fIN = 5MHz, unless otherwise noted.
HARMONIC DISTORTION vs FREQUENCY
(Differential, 2Vp-p, MGS = 001)
NOISE FIGURE vs VCACNTL
–30
–35
–40
–45
–50
–55
–60
–65
–70
–75
55
50
45
40
35
30
25
20
15
10
5
VCACNTL = 0.2V, H2
VCACNTL = 0.2V, H3
VCACNTL = 3.0V, H2
VCACNTL = 3.0V, H3
0
100k
1M
10M
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
VCACNTL (V)
Frequency (Hz)
HARMONIC DISTORTION vs FREQUENCY
(Differential, 2Vp-p, MGS = 011)
HARMONIC DISTORTION vs FREQUENCY
(Differential, 2Vp-p, MGS = 111)
–30
–35
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
–30
–35
–40
–45
–50
–55
–60
–65
–70
–75
–80
VCACNTL = 0.2V, H2
VCACNTL = 0.2V, H3
VCACNTL = 3.0V, H2
VCACNTL = 3.0V, H3
VCA
VCA
VCA
VCA
= 0.2V, H2
= 0.2V, H3
= 3.0V, H2
= 3.0V, H3
CNTL
CNTL
CNTL
CNTL
100k
1M
10M
100k
1M
Frequency (MHz)
10M
Frequency (Hz)
HARMONIC DISTORTION vs FREQUENCY
(Single-Ended, 1Vp-p, MGS = 001)
HARMONIC DISTORTION vs FREQUENCY
(Single-Ended, 1Vp-p, MGS = 011)
–30
–35
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
–30
–35
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
VCACNTL = 0.2V, H2
VCA
VCA
VCA
VCA
= 0.2V, H2
= 0.2V, H3
= 3.0V, H2
= 3.0V, H3
CNTL
CNTL
CNTL
CNTL
VCACNTL = 0.2V, H3
VCACNTL = 3.0V, H2
VCACNTL = 3.0V, H3
100k
1M
10M
100k
1M
10M
Frequency (Hz)
Frequency (Hz)
VCA2614
6
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SBOS185D
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground, differential output (2Vp-p) MGS = 011, and fIN = 5MHz, unless otherwise noted.
HARMONIC DISTORTION vs VCACNTL
(Differential, 2Vp-p, 5MHz)
HARMONIC DISTORTION vs FREQUENCY
(Single-Ended, 1Vp-p, MGS = 111)
0
–5
–30
–35
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
MGS = 001, H2
MGS = 011, H2
MGS = 111, H2
MGS = 001, H3
MGS = 011, H3
MGS = 111, H3
–10
–15
–20
–25
–30
–35
–40
–45
–50
–55
–60
–65
–70
–75
–80
VCA
VCA
VCA
VCA
= 0.2V, H2
CNTL
CNTL
CNTL
CNTL
= 0.2V, H3
= 3.0V, H2
= 3.0V, H3
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
VCACNTL (V)
100k
1M
10M
Frequency (Hz)
INTERMODULATION DISTORTION
(Single-Ended, 1Vp-p, f = 10MHz, VCACNTRL = 3.0V)
HARMONIC DISTORTION vs VCACNTL
(Single-Ended, 1Vp-p, 5MHz)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
0
–5
MGS = 001, H2
MGS = 011, H2
MGS = 111, H2
MGS = 001, H3
MGS = 011, H3
MGS = 111, H3
–10
–15
–20
–25
–30
–35
–40
–45
–50
–55
–60
–65
–70
–75
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
VCACNTL (V)
9.6
9.8
10
10.2
10.4
Frequency (MHz)
CROSSTALK vs FREQUENCY
(Differential, 2Vp-p, MGS = 011)
INTERMODULATION DISTORTION
(Differential, 2Vp-p, f = 10MHz, VCACNTL = 3.0V)
10
0
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–10
–20
–30
–40
–50
–60
–70
–80
–90
VCACNTRL = 0V
VCACNTRL = 1.5V
VCACNTRL = 3.0V
9.6
9.8
10
10.2
10.4
1
10
Frequency (MHz)
100
Frequency (MHz)
VCA2614
SBOS185D
7
www.ti.com
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground, differential output (2Vp-p) MGS = 011, and fIN = 5MHz, unless otherwise noted.
OVERLOAD DISTORTION vs FREQUENCY
ICC vs TEMPERATURE
52
50
48
46
44
42
40
0
–10
–20
–30
–40
–50
–60
0.5V
0.1
1V
0.25V
–40
–25
–10
5
20
35
50
65
80
95
1
100
Temperature (°C)
Frequency (Hz)
GROUP DELAY vs FREQUENCY
VCACNTL = 3.0V
15
14
13
12
11
10
9
8
7
6
5
4
3
VCACNTL = 0.2V
2
1
0
1
10
100
Frequency (MHz)
VCA2614
8
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SBOS185D
power-on time of the VCA2614 would be increased. If a
decrease in the power-on time is needed, the value can be
decreased to no less than 100pF.
OVERVIEW
The VCA2614 is a dual-channel, VGA consisting of three
primary blocks: an Input Buffer, a VCA, and a PGA (as
shown in Figure 1). All stages are AC-coupled with the
coupling into the PGA stage being made variable by placing
an external capacitor between the CP1 and CP2 pins. This will
be discussed further in the PGA section. By using the internal
coupling into the PGA, the result is a high-pass filter charac-
teristic with cutoff at approximately 75kHz. The output PGA
naturally rolls off at around 40MHz, making the usable
bandwidth of the VCA2614 between 75kHz and 40MHz.
VOLTAGE-CONTROLLED ATTENUATOR
The magnitude of the VCA input signal from the input buffer
is reduced by a programmable attenuation factor, set by the
analog VCA Control Voltage (VCACNTL) at pin 24. The maxi-
mum attenuation is programmable by using the three MGS
bits (pins 21, 22, and 23). Figure 2 illustrates this dual-adjust
characteristic.
The MGS bits adjust the overall range of attenuation and
maximum gain while the VCACNTL voltage adjusts the actual
attenuation factor. At any given maximum gain setting, the
analog variable gain characteristic is linear in dB as a
function of the control voltage, and is created as a piecewise
approximation of an ideal dB-linear transfer function, see
Figure 4. The VCA control circuitry is common to both
channels of the VCA2614. The range for the VCACNTL input
spans from 0V to 3V. Although overdriving the VCACNTL input
above the recommended 3V maximum will not damage the
part, this condition should be avoided.
Channel A
Output
Channel A
Input
Buffer
VCA
PGA
Maximum
Gain
Select
Analog
Control
VCA
Control
MGS
Channel B
Output
Channel B
Input
Buffer
VCA
PGA
0
Minimum Attenuation
FIGURE 1. Simplified Block Diagram of the VCA2614.
–24.1
INPUT BUFFER
The input buffer is a unity gain amplifier (gain of +1) with a
bandwidth of 100MHz with an input resistance of approxi-
mately 600kΩ. The input buffer isolates the circuit driving the
VCA2614 inputs from the internal VCA block, which would
present a varying impedance to the input circuitry. To allow
symmetrical operation of the input buffer, the input to the
buffer must be AC-coupled through an external capacitor.
The recommended value of the capacitor is 0.01µF. It should
be noted that if the capacitor value were increased, the
Maximum Attenuation
–40
0
3.0V
Control Voltage
FIGURE 2. Swept Attenuator Characteristic.
RS
OUTPUT
INPUT
Q1A
Q1B
Q2A
Q2B
Q3A
Q3B
Q4A
Q4B
Q5A
Q5B
VCM
A1
A2
A3
A4
A5
B1
B2
PROGRAMMABLE ATTENUATOR SECTION
FIGURE 3. Programmable Attenuator Section.
VCA2614
SBOS185D
9
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Attenuator
Input
A1 to A10 Attenuator Stages
QS
Attenuator
Output
RS
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
VCM
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
V1
V2
V3
V4
V5
V6
V7
V8
V9
V10
Control
Input
C1 to C10 Clipping Amplifiers
0dB
–4.4dB
Attenuation Characteristic of Individual FETs
VCM – VT
0
V1
V2
V3
V4
V5
V6
V7
V8
V9
V10
Characteristic of Attenuator Control Stage Output
OVERALL CONTROL CHARACTERISTICS OF ATTENUATOR
0dB
–44dB
0.3V
3V
Control Signal
FIGURE 4. Piecewise Approximation to Logarithmic Control Characteristics.
VCA2614
10
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SBOS185D
PGA POST-AMPLIFIER
MGS
SETTING
ATTENUATOR GAIN
VCACNTL = 0.02V to 3V
ATTENUATOR +
DIFFERENTIAL PGA GAIN
Figure 5 shows a simplified circuit diagram of the PGA block.
As stated before, the input to the PGA is AC-coupled by an
internal capacitor. Provisions are made so that an external
capacitor can be placed in parallel with the internal capacitor,
thus lowering the usable low-frequency bandwidth. The low-
frequency bandwidth is set by the following equation:
000
001
010
011
100
101
110
111
Not Valid
Not Valid
–24.1dB to 0dB
–26.9dB to 0dB
–29.5dB to 0dB
–32.4dB to 0dB
–34.8dB to 0dB
–37.3dB to 0dB
–40.0dB to 0dB
2.6dB to 26.7dB
2.6dB to 29.5dB
3.0dB to 35.6dB
3.1dB to 35.5dB
3.4dB to 38.3dB
3.7dB to 44.1dB
4.1dB to 44.2dB
1
2• π • 500kΩ • 220pF + C
(
)
)
(
EXTERNAL
TABLE I. MGS Settings.
where CEXTERNAL is the external capacitor value in picofarads.
Care should be taken to avoid using too large a value of
capacitor, as this can increase the power-on delay time.
input buffer noise dominates; at maximum VCA attenuation
(large input signals), the PGA noise dominates. Note that if
the PGA output is used single-ended, the apparent gain will
be 6dB lower.
As described previously, the PGA gain is programmed with
the same MGS bits that control the VCA maximum attenua-
tion factor. Specifically, the maximum PGA gain at each
MGS setting is the inverse (reciprocal) of the maximum VCA
attenuation at that setting. Therefore, the VCA + PGA overall
gain will always be 0dB (unity) when the analog VCACNTL
input is set to 0V (the maximum attenuation for VCA). For
VCACNTL = 3V (no attenuation), the VCA + PGA gain will be
controlled by the programmed PGA gain. For clarity, the gain
and attenuation factors are detailed in Table I.
LAYOUT CONSIDERATIONS
The VCA2614 is an analog amplifier capable of high gain.
When working on a PCB layout for the VCA2614, it is
recommended to utilize a solid ground plane that is con-
nected to analog ground. This helps to maximize the noise
performance of the VCA2614.
Adequate power-supply decoupling must be used in order to
achieve the best possible performance. Decoupling capaci-
tors on the VCACNTL voltage should also be used to help
minimize noise. Recommended values can be obtained from
the layout diagram of Figure 6.
The PGA architecture converts the single-ended signal from
the VCA into a differential signal. Low input noise was also
a requirement of the PGA design due to the large amount of
signal attenuation that can be asserted before the PGA. At
minimum VCA attenuation (used for small input signals), the
VDD
To Bias
Circuitry
Q1
Q11
Q12
Q9
RL
RL
VCAOUT
P
VCAOUTN
Q3
Q8
VCM
VCM
RS1
RS2
Q13
Q4
Q7
+In
–In
Q14
Q2
Q10
Q5
Q6
To Bias
Circuitry
FIGURE 5. Simplified Block Diagram of the PGA Section with the VCA2614.
VCA2614
SBOS185D
11
www.ti.com
+5V
0.1µF
1µF
+5V
0.1µF
0.1µF
1µF
1µF
28
3
5
0.01µF
0.01µF
0.01µF
V
DDA VDDR VCM
1
25
26
NOUTA
INA
INA
NOUTA
POUTA
POUTA
VCA2614
0.01µF
0.01µF
16
15
NOUTB
POUTB
24
NOUTB
0.01µF
8
INB
INB
POUTB
VDDB
13
VBIAS VCNTL
4
1µF
0.1µF
0.1µF
+5V
1µF
0.1µF
VCACNTL
FIGURE 6. VCA2614 Layout.
VCA2614
12
www.ti.com
SBOS185D
PACKAGE DRAWING
PBS (S-PQFP-G32)
PLASTIC QUAD FLATPACK
0,23
0,17
M
0,50
0,08
24
17
25
32
16
9
0,13 NOM
1
8
3,50 TYP
Gage Plane
5,05
SQ
4,95
0,25
7,10
SQ
0,10 MIN
6,90
0°–7°
0,70
0,40
1,05
0,95
Seating Plane
0,08
1,20 MAX
4087735/A 11/95
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
VCA2614
SBOS185D
13
www.ti.com
PACKAGE OPTION ADDENDUM
www.ti.com
9-Dec-2004
PACKAGING INFORMATION
Orderable Device
Status (1)
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
TQFP
TQFP
Drawing
VCA2614Y/250
VCA2614Y/2K
ACTIVE
ACTIVE
PBS
32
32
250
None
None
CU SNPB
CU SNPB
Level-3-220C-168 HR
Level-3-220C-168 HR
PBS
2000
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - May not be currently available - please check http://www.ti.com/productcontent for the latest availability information and additional
product content details.
None: Not yet available Lead (Pb-Free).
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean "Pb-Free" and in addition, uses package materials that do not contain halogens,
including bromine (Br) or antimony (Sb) above 0.1% of total product weight.
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDECindustry standard classifications, and peak solder
temperature.
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Addendum-Page 1
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