ADS-883 [ETC]
14-Bit, 2MHz, Low-Power Sampling A/D Converters; 14位，为2MHz ，低功耗采样A / D转换器
| 型号： | ADS-883 |
| 厂家： | 
ETC |
| 描述： | 14-Bit, 2MHz, Low-Power Sampling A/D Converters |
| 文件： | 总8页 (文件大小：192K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
®
ADS -9 2 9
14-Bit, 2MHz, Low-Power
Sampling A/D Converters
FEATURES
• 14-bit resolution
• 2MHz sampling rate
• No missing codes
• Functionally complete
• Small 24-pin DDIP or SMT package
• Low power, 1.7 Watts
• Operates from ±15V or ±12V supplies
• Edge-triggered; No pipeline delays
• Bipolar ±5V input range
GENERAL DESCRIPTION
INPUT/OUTPUT CONNECTIONS
The ADS-929 is a high-performance, 14-bit, 2MHz sampling
A/D converter. This device samples input signals up to Nyquist
frequencies with no missing codes. The ADS-929 features
outstanding dynamic performance including a THD of –79dB.
PIN
FUNCTION
PIN
FUNCTION
1
2
BIT 14 (LSB)
BIT 13
BIT 12
BIT 11
BIT 10
BIT 9
24
23
22
21
20
19
18
17
16
15
14
13
–12V/–15V SUPPLY
ANALOG GROUND
+12V/+15V SUPPLY
+10V REFERENCE OUT
ANALOG INPUT
ANALOG GROUND
BIT 1 (MSB)
3
Housed in a small 24-pin DDIP or SMT (gull-wing) package,
the functionally complete ADS-929 contains a fast-settling
sample-hold amplifier, a subranging (two-pass) A/D converter,
a precise voltage reference, timing/control logic, and error-
correction circuitry. Digital input and output levels are TTL.
4
5
6
7
8
BIT 8
BIT 7
BIT 2
Requiring ±15V (or ±12V) and +5V supplies, the ADS-929
typically dissipates 1.7W (1.4W for ±12V). The unit is offered
with a bipolar input (–5V to +5V). Models are available for use
in either commercial (0 to +70°C) or military (–55 to +125°C)
operating temperature ranges. Applications include radar,
sonar, spectrum analysis, and graphic/medical imaging.
9
BIT 6
START CONVERT
EOC
10
11
12
BIT 5
BIT 4
DIGITAL GROUND
+5V SUPPLY
BIT 3
DAC
18 BIT 1 (MSB)
17 BIT 2
+10V REF. OUT 21
REF
12 BIT 3
11 BIT 4
S2
10 BIT 5
FLASH
ADC
9
8
7
6
5
4
3
2
1
BIT 6
BIT 7
S/H
S1
BIT 8
BUFFER
BIT 9
ANALOG INPUT 20
–
+
BIT 10
BIT 11
BIT 12
BIT 13
BIT 14 (LSB)
START CONVERT 16
EOC 15
TIMING AND
CONTROL LOGIC
13
+5V SUPPLY
14
DIGITAL GROUND
22
+12V/+15V SUPPLY
19, 23
24
–12V/–15V SUPPLY
ANALOG GROUND
Figure 1. ADS-929 Functional Block Diagram
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.) • Tel: (508) 339-3000 Fax: (508) 339-6356 • For immediate assistance: (800) 233-2765
®
®
ADS -9 2 9
ABSOLUTE MAXIMUM RATINGS
PHYSICAL/ENVIRONMENTAL
PARAMETERS
LIMITS
UNITS
PARAMETERS
MIN.
TYP.
MAX.
UNITS
+12V/+15V Supply (Pin 22)
–12V/–15V Supply (pin 24)
+5V Supply (Pin 13)
Digital Input (Pin 16)
Analog Input (Pin 20)
0 to +16
0 to –16
0 to +6
Volts
Volts
Volts
Volts
Volts
°C
Operating Temp. Range, Case
ADS-929MC, GC
ADS-929MM, GM, 883
Thermal Impedance
θjc
0
–55
—
—
+70
+125
°C
°C
–0.3 to +VDD +0.3
±15
6
24
—
°C/Watt
°C/Watt
°C
θca
Lead Temperature (10 seconds)
+300
Storage Temperature
–65
+150
Package Type
Weight
24-pin, metal-sealed, ceramic DDIP or SMT
0.42 ounces (12 grams)
FUNCTIONAL SPECIFICATIONS
(TA = +25°C, ±VCC = ±15V (or ±12V), +VDD = +5V, 2MHz sampling rate, and a minimum 1 minute warmup ➀unless otherwise specified.)
+25°C
TYP.
0 to +70°C
TYP.
–55 to +125°C
TYP.
ANALOG INPUT
MIN.
MAX.
MIN.
MAX.
MIN.
MAX.
UNITS
Input Voltage Range ➁
Input Resistance
Input Capacitance
—
—
—
±5
1
7
—
—
15
—
—
—
±5
1
7
—
—
15
—
—
—
±5
1
7
—
—
15
Volts
kΩ
pF
DIGITAL INPUT
Logic Levels
Logic "1"
Logic "0"
+2.0
—
—
—
20
—
—
—
—
200
—
+0.8
+20
–20
—
+2.0
—
—
—
20
—
—
—
—
200
—
+0.8
+20
–20
—
+2.0
—
—
—
20
—
—
—
—
200
—
+0.8
+20
–20
—
Volts
Volts
µA
µA
ns
Logic Loading "1"
Logic Loading "0"
Start Convert Positive Pulse Width ➂
STATIC PERFORMANCE
Resolution
—
—
—
—
—
—
—
14
14
—
—
—
—
—
—
—
—
—
14
14
—
—
—
—
—
—
—
—
—
14
14
±1
—
—
Bits
LSB
LSB
%FSR
%FSR
%FSR
%
Integral Nonlinearity (fin = 10kHz)
Differential Nonlinearity (fin = 10kHz)
Full Scale Absolute Accuracy
Bipolar Zero Error (Tech Note 2)
Bipolar Offset Error (Tech Note 2)
Gain Error (Tech Note 2)
±0.5
±0.5
±0.05
±0.05
±0.05
±0.1
—
±0.75
±0.5
±0.15
±0.1
±0.15
±0.3
—
±0.95
±0.15
±0.15
±0.15
±0.3
—
±0.95
±0.4
±0.25
±0.4
±0.5
—
±0.5
±0.3
±0.4
±0.4
±0.5
—
±0.99
±0.5
±0.75
±0.95
±1.25
—
No Missing Codes (fin = 10kHz)
Bits
DYNAMIC PERFORMANCE
Peak Harmonics (–0.5dB)
dc to 500kHz
500kHz to 1MHz
—
—
–80
–80
–75
–74
—
—
–80
–80
–75
–74
—
—
–79
–74
–74
–67
dB
dB
Total Harmonic Distortion (–0.5dB)
dc to 500kHz
500kHz to 1MHz
—
—
–79
–79
–74
–74
—
—
–79
–79
–74
–74
—
—
–77
–72
–72
–67
dB
dB
Signal-to-Noise Ratio
(w/o distortion, –0.5dB)
dc to 500kHz
76
75
78
77
—
—
76
75
78
77
—
—
75
74
77
76
—
—
dB
dB
500kHz to 1MHz
Signal-to-Noise Ratio ➃
(& distortion, –0.5dB)
dc to 500kHz
72
70
75
75
—
—
72
70
75
75
—
—
71
67
74
73
—
—
dB
dB
500kHz to 1MHz
Two-Tone Intermodulation
Distortion (fin = 200kHz,
500kHz, fs = 2MHz, –0.5dB)
Noise
—
—
–83
300
—
—
—
—
–82
450
—
—
—
—
–80
600
—
—
dB
µVrms
Input Bandwidth (–3dB)
Small Signal (–20dB input)
Large Signal (–0.5dB input)
Feedthrough Rejection (fin = 1MHz)
Slew Rate
Aperture Delay Time
Aperture Uncertainty
S/HAcquisitionTime
(to ±0.003%FSR, 10V step)
Overvoltage Recovery Time ➄
A/D Conversion Rate
—
—
—
—
—
—
9
8
82
±200
±20
5
—
—
—
—
—
—
—
—
—
—
—
—
9
8
82
±200
±20
5
—
—
—
—
—
—
—
—
—
—
—
—
9
8
82
±200
±20
5
—
—
—
—
—
—
MHz
MHz
dB
V/µs
ns
ps rms
150
—
2
190
400
—
230
500
—
150
—
2
190
400
—
230
500
—
150
—
2
190
400
—
230
500
—
ns
ns
MHz
2
®
®
ADS -9 2 9
+25°C
TYP.
0 to +70°C
TYP.
–55 to +125°C
TYP.
ANALOG OUTPUT
MIN.
MAX.
MIN.
MAX.
MIN.
MAX.
UNITS
Internal Reference
Voltage
Drift
+9.95
—
—
+10.0
±5
—
+10.05
—
1.5
+9.95
—
—
+10.0
±5
—
+10.05
—
1.5
+9.95
—
—
+10.0
±5
—
+10.05
—
1.5
Volts
ppm/°C
mA
External Current
DIGITAL OUTPUTS
Logic Levels
Logic "1"
Logic "0"
+2.4
—
—
—
—
—
—
—
+0.4
–4
+2.4
—
—
—
—
—
—
—
+0.4
–4
+2.4
—
—
—
—
—
—
—
+0.4
–4
Volts
Volts
mA
Logic Loading "1"
Logic Loading "0"
Delay, Falling Edge of EOC
to Output Data Valid
Output Coding
—
+4
—
+4
—
+4
mA
—
—
35
—
—
35
—
—
35
ns
Offset Binary
POWER REQUIREMENTS, ±15V
Power Supply Ranges
+15V Supply
–15V Supply
+14.5
–14.5
+4.75
+15.0
–15.0
+5.0
+15.5
–15.5
+5.25
+14.5
–14.5
+4.75
+15.0
–15.0
+5.0
+15.5
–15.5
+5.25
+14.5
–14.5
+4.75
+15.0
–15.0
+5.0
+15.5
–15.5
+5.25
Volts
Volts
Volts
+5V Supply
Power Supply Currents
+15V Supply
–15V Supply
+5V Supply
Power Dissipation
Power Supply Rejection
—
—
—
—
—
+45
–43
+80
1.7
—
+55
–50
+90
1.9
±0.01
—
—
—
—
—
+45
–43
+80
1.7
—
+55
–50
+90
1.9
±0.01
—
—
—
—
—
+45
–43
+80
1.7
—
+55
–50
+90
1.9
±0.01
mA
mA
mA
Watts
%FSR/%V
POWER REQUIREMENTS, ±12V
Power Supply Ranges
+12V Supply
–12V Supply
+11.5
–11.5
+4.75
+12.0
–12.0
+5.0
+12.5
–12.5
+5.25
+11.5
–11.5
+4.75
+12.0
–12.0
+5.0
+12.5
–12.5
+5.25
+11.5
–11.5
+4.75
+12.0
–12.0
+5.0
+12.5
–12.5
+5.25
Volts
Volts
Volts
+5V Supply
Power Supply Currents
+12V Supply
–12V Supply
+5V Supply
Power Dissipation
Power Supply Rejection
—
—
—
—
—
+45
–43
+80
1.4
—
+55
–50
+90
1.6
±0.01
—
—
—
—
—
+45
–43
+80
1.4
—
+55
–50
+90
1.6
±0.01
—
—
—
—
—
+45
–43
+80
1.4
—
+55
–50
+90
1.6
±0.01
mA
mA
mA
Watts
%FSR/%V
Footnotes:
➀ All power supplies must be on before applying a start convert pulse. All supplies
and the clock (START CONVERT) must be present during warmup periods. The
device must be continuously converting during this time. There is a slight
degradation in performance when using ±12V supplies.
➃ Effective bits is equal to:
Full Scale Amplitude
Actual Input Amplitude
(SNR + Distortion) – 1.76 + 20 log
6.02
➁ See Ordering Information for 0 to +10V input range. Contact DATEL for availability
➄ This is the time required before the A/D output data is valid after the analog input
is back within the specified range.
of other input voltage ranges.
➂ A 2MHz clock with a 200ns wide start convert pulse is used for all production
testing. See Timing Diagram for more details.
2. The ADS-929 achieves its specified accuracies without the
need for external calibration. If required, the device's small
initial offset and gain errors can be reduced to zero using
the input circuit of Figure 2. When using this circuit, or any
similar offset and gain-calibration hardware, make adjust-
ments following warmup. To avoid interaction, always adjust
offset before gain.
TECHNICAL NOTES
1. Obtaining fully specified performance from the ADS-929
requires careful attention to pc-card layout and power
supply decoupling. The device's analog and digital ground
systems are connected to each other internally. For
optimal performance, tie all ground pins (14, 19 and 23)
directly to a large analog ground plane beneath the
package.
3. When operating the ADS-929 from ±12V supplies, do not
drive external circuitry with the REFERENCE OUTPUT. The
reference's accuracy and drift specifications may not be
met, and loading the circuit may cause accuracy errors
within the converter.
Bypass all power supplies, as well as the REFERENCE
OUTPUT (pin 21), to ground with 4.7µF tantalum capaci-
tors in parallel with 0.1µF ceramic capacitors. Locate the
bypass capacitors as close to the unit as possible. If the
user-installed offset and gain adjusting circuit shown in
Figure 2 is used, also locate it as close to the ADS-929 as
possible.
4. Applying a start convert pulse while a conversion is in
progress (EOC = logic "1") initiates a new and inaccurate
conversion cycle. Data for the interrupted and subsequent
conversions will be invalid.
3
®
®
ADS -9 2 9
Zero/Offset Adjust Procedure
1. Apply a train of pulses to the START CONVERT input
CALIBRATION PROCEDURE
(Refer to Figures 2 and 3)
(pin 16) so the converter is continuously converting. If using
LED's on the outputs, a 200kHz conversion rate will reduce
flicker.
Any offset and/or gain calibration procedures should not be
implemented until devices are fully warmed up. To avoid
interaction, offset must be adjusted before gain. The ranges of
adjustment for the circuit of Figure 2 are guaranteed to
compensate for the ADS-929's initial accuracy errors and may
not be able to compensate for additional system errors.
2. Apply +305µV to the ANALOG INPUT (pin 20).
3. Adjust the offset potentiometer until the output bits are
a 1 and all 0's and the LSB flickers between 0 and 1.
All fixed resistors in Figure 2 should be metal-film types, and
multiturn potentiometers should have TCR’s of 100ppm/°C or
less to minimize drift with temperature.
Gain Adjust Procedure
1. Apply +4.999085V to the ANALOG INPUT (pin 20).
A/D converters are calibrated by positioning their digital outputs
exactly on the transition point between two adjacent digital
output codes. This can be accomplished by connecting LED's
to the digital outputs and adjusting until certain LED's "flicker"
equally between on and off. Other approaches employ digital
comparators or microcontrollers to detect when the outputs
change from one code to the next.
2. Adjust the gain potentiometer until the output bits are all 1's
and the LSB flickers between 1 and 0.
Table 1. Zero and Gain Adjust
INPUT VOLTAGE
RANGE
ZERO ADJUST
+½ LSB
GAIN ADJUST
+FS –1½ LSB
For the ADS-929, offset adjusting is normally accomplished at
the point where the MSB is a 1 and all other output bits are 0's
and the LSB just changes from a 0 to a 1. This digital output
transition ideally occurs when the applied analog input is
+½ LSB (+305µV).
±5V
+305µV
+4.999085V
Table 2. Output Coding
Gain adjusting is accomplished when all bits are 1's and the
LSB just changes from a 1 to a 0. This transition ideally occurs
when the analog input is at +full scale minus 1½ LSB's
(+4.999085V).
OUTPUT CODING
INPUT RANGE
±5V
BIPOLAR
SCALE
MSB
LSB
11 1111 1111 1111
11 1000 0000 0000
11 0000 0000 0000
10 0000 0000 0000
01 0000 0000 0000
00 1000 0000 0000
00 0000 0000 0001
00 0000 0000 0000
+4.99939
+3.75000
+2.50000
0.00000
–2.50000
–3.75000
–4.99939
–5.00000
+FS –1 LSB
+3/4 FS
+1/2FS
0
–1/2FS
–3/4FS
–FS +1 LSB
–FS
+15V
W
W
2kW
20k
200k
ZERO/
OFFSET
ADJUST
GAIN
ADJUST
–15V
+15V
W
1.98k
SIGNAL
INPUT
To Pin 20
of ADS-929
W
50
Coding is offset binary; 1LSB = 610µV.
–15V
Figure 2. ADS-929 Calibration Circuit
18 BIT 1 (MSB)
17 BIT 2
13
+5V
+
12 BIT 3
4.7µF
0.1µF
DIGITAL
GROUND
11 BIT 4
14
24
10 BIT 5
9
8
7
6
5
4
3
2
1
BIT 6
ADS-929
BIT 7
–12V/–15V
+12V/+15V
BIT 8
4.7µF
4.7µF
0.1µF
0.1µF
+
+
BIT 9
ANALOG
GROUND
19, 23
22
BIT 10
BIT 11
BIT 12
BIT 13
BIT 14 (LSB)
ANALOG
INPUT
–5V to +5V
20
15 EOC
21 +10V REF. OUT
+
START
CONVERT
0.1µF
4.7µF
16
Figure 3. Typical ADS-929 Connection Diagram
4
®
®
ADS -9 2 9
Electrically-insulating, thermally-conductive "pads" may be
THERMAL REQUIREMENTS
installed underneath the package. Devices should be soldered
to boards rather than "socketed", and of course, minimal air
flow over the surface can greatly help reduce the package
temperature.
All DATEL sampling A/D converters are fully characterized and
specified over operating temperature (case) ranges of
0 to +70°C and –55 to +125°C. All room-temperature
(TA = +25°C) production testing is performed without the use of
heat sinks or forced-air cooling. Thermal impedance figures for
each device are listed in their respective specification tables.
In more severe ambient conditions, the package/junction
temperature of a given device can be reduced dramatically
(typically 35%) by using one of DATEL's HS Series heat sinks.
See Ordering Information for the assigned part number. See
page 1-183 of the DATEL Data Acquisition Components
Catalog for more information on the HS Series. Request
DATEL Application Note AN-8, "Heat Sinks for DIP Data
Converters", or contact DATEL directly, for additional
information.
These devices do not normally require heat sinks, however,
standard precautionary design and layout procedures should
be used to ensure devices do not overheat. The ground and
power planes beneath the package, as well as all pcb signal
runs to and from the device, should be as heavy as possible to
help conduct heat away from the package.
N
N + 1
START
CONVERT
200ns
typ.
10ns typ.
Hold
Acquisition Time
310ns typ.
INTERNAL S/H
190ns
±40ns
70ns ±10ns
30ns typ.
Conversion Time
EOC
360ns ±20ns
35ns max.
75ns max.
OUTPUT
Data (N – 1) Valid
DATA
Data N Valid
425ns min.
Invalid
Data
Notes: 1. fs = 2MHz.
2. The ADS-929 is an edge-triggered device. All internal operations
are triggered by the rising edge of the start convert pulse, which
may be as narrow as 20nsec. All production testing is performed
at a 2MHz sampling rate with 200nsec wide start pulses. For
lower sampling rates, wider start pulses may be used, however, a
minimum pulse width low of 20nsec must be maintained.
Figure 4. ADS-929 Timing Diagram
5
®
®
ADS-929
+
+
+
+
+
+
+
+
6
®
®
ADS -9 2 9
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
0
100
200
300
400
500
600
700
800
900
1000
Frequency (kHz)
(fs = 2MHz, fin = 975kHz, Vin = –0.5dB, 16,384-point FFT)
Figure 6. ADS-929 FFT Analysis
+0.37
0
–0.37
0
16,384
Digital Output Code
0
16,384
Digital Output Code
Figure 7. ADS-929 Histogram and Differential Nonlinearity
7
®
®
ADS -9 2 9
MECHANICAL DIMENSIONS INCHES (mm)
1.31 MAX.
(33.27)
Dimension Tolerances (unless otherwise indicated):
2 place decimal (.XX) ±0.010 (±0.254)
3 place decimal (.XXX) ±0.005 (±0.127)
24-Pin DDIP
Versions
24
1
13
12
Lead Material: Kovar alloy
0.80 MAX.
(20.32)
Lead Finish: 50 microinches (minimum) gold plating
over 100 microinches (nominal) nickel plating
ADS-929MC
ADS-929MM
ADS-929/883
ADS-919MC
ADS-919MM
0.100 TYP.
(2.540)
1.100
(27.940)
0.235 MAX.
(5.969)
PIN 1 INDEX
0.200 MAX.
(5.080)
+0.002
–0.001
0.010
(0.254)
0.190 MAX.
(4.826)
0.100
(2.540)
0.100
(2.540)
0.600 ±0.010
SEATING
(15.240)
PLANE
0.025
(0.635)
0.040
(1.016)
0.018 ±0.002
(0.457)
1.31 MAX.
(33.02)
Dimension Tolerances (unless otherwise indicated):
2 place decimal (.XX) ±0.010 (±0.254)
3 place decimal (.XXX) ±0.005 (±0.127)
24-Pin
Surface Mount
Versions
13
12
24
Kovar alloy
Lead Material:
0.80 MAX.
(20.32)
Lead Finish: 50 microinches (minimum) gold plating
over 100 microinches (nominal) nickel plating
ADS-929GC
ADS-929GM
ADS-919GC
ADS-919GM
1
0.020 TYP.
(0.508)
0.060 TYP.
0.015
(1.524)
0.190 MAX.
(4.826)
(0.381)
MAX. radius
for any pin
0.130 TYP.
(3.302)
PIN 1
INDEX
0.100
(2.540)
0.020
(0.508)
0.010 TYP.
(0.254)
0.100 TYP.
(2.540)
0.040
(1.016)
ORDERING INFORMATION
ANALOG
MODEL
OPERATING
NUMBER
TEMP. RANGE
INPUT
ACCESSORIES
ADS-929MC
ADS-929MM
ADS-929/883
ADS-929GC
ADS-929GM
ADS-919MC
ADS-919MM
ADS-919GC
ADS-919GM
0 to +70°C
Bipolar (±5V)
Bipolar (±5V)
Bipolar (±5V)
Bipolar (±5V)
Bipolar (±5V)
ADS-B919/929
HS-24
Evaluation Board (without ADS-929)
Heat Sinks for all ADS-919/929 DDIP models
–55 to +125°C
–55 to +125°C
0 to +70°C
–55 to +125°C
0 to +70°C
–55 to +125°C
0 to +70°C
–55 to +125°C
Receptacles for PC board mounting can be ordered through
AMP Inc. Part #3-331272-8 (Component Lead Socket), 24 required.
For MIL-STD-883 product specifications, contact DATEL.
* For information, see ADS-919 data sheet.
Unipolar (0 to +10V)*
Unipolar (0 to +10V)*
Unipolar (0 to +10V)*
Unipolar (0 to +10V)*
®
®
ISO 9001
R
E
G
I
S
T
E
R
E
D
DS-0287B
11/96
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
Internet: www.datel.com E-mail:sales@datel.com
Data Sheet Fax Back: (508) 261-2857
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 1-34-60-01-01
DATEL GmbH München, Germany Tel: 89-544334-0
DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025
DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein
do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.
相关型号：
©2020 ICPDF网 联系我们和版权申明