ADS-883中文资料_数据手册_规格书

®

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.

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

°C

Operating Temp. Range, Case

ADS-929MC, GC

ADS-929MM, GM, 883

Thermal Impedance

θjc

0

–55

—

+70

+125

°C

–0.3 to +VDD +0.3

±15

6

24

—

°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

µA

ns

Logic Loading "1"

Logic Loading "0"

Start Convert Positive Pulse Width ➂

STATIC PERFORMANCE

Resolution

—

14

—

14

—

14

±1

—

Bits

LSB

%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

±0.05

±0.1

—

±0.75

±0.5

±0.15

±0.1

±0.15

±0.3

—

±0.95

±0.15

±0.3

—

±0.95

±0.4

±0.25

±0.4

±0.5

—

±0.5

±0.3

±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

–75

–74

—

–80

–75

–74

—

–79

–74

–67

dB

Total Harmonic Distortion (–0.5dB)

dc to 500kHz

500kHz to 1MHz

—

–79

–74

—

–79

–74

—

–77

–72

–67

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

500kHz to 1MHz

Signal-to-Noise Ratio ➃

(& distortion, –0.5dB)

dc to 500kHz

72

70

75

—

72

70

75

—

71

67

74

73

—

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

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

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

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

+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

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

+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

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

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

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

(T^A= +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)

ADS-B919/929

HS-24

Evaluation Board (without ADS-929)

Heat Sinks for all ADS-919/929 DDIP models

–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)*

®

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.

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ADS-916GE-C	DATEL	Sampling A/D Converters	获取价格
ADS-916MC-C	MURATA	A/D Converter, 14-Bit, 1 Func, Hybrid, CDIP24	获取价格

ADS-883

ADS-883 概述

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ADS-883 相关器件

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