Файл:AD565A, AD566A.pdf

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a FEATURES Single Chip Construction Very High-Speed Settling to 1/2 LSB AD565A: 250 ns max AD566A: 350 ns max Full-Scale Switching Time: 30 ns Guaranteed for Operation with ؎12 V Supplies: AD565A with –12 V Supply: AD566A Linearity Guaranteed Over Temperature: 1/2 LSB max (K, T Grades) Monotonicity Guaranteed Over Temperature Low Power: AD566A = 180 mW max; AD565A = 225 mW max Use with On-Board High-Stability Reference (AD565A) or with External Reference (AD566A) Low Cost MlL-STD-883-Compliant Versions Available

High Speed 12-Bit Monolithic D/A Converters AD565A*/AD566A* FUNCTIONAL BLOCK DIAGRAM REF OUT

VCC

BIPOLAR OFF

4

3

8 11 20V SPAN

AD565A

10V

5k 9.95k

19.95k

REF 6 IN

REF GND

10 10V SPAN

0.5mA

5k

IREF

9

DAC

20k

IO

IOUT = 4 x I REF x CODE

5

CODE INPUT 12

7 –VEE

24

13

POWER MSB GND

LSB BIPOLAR OFF

7 11 20V SPAN

AD566A

5k

4 9.95k

PRODUCT DESCRIPTION

The AD565A and AD566A are fast 12-bit digital-to-analog converters which incorporate the latest advances in analog circuit design to achieve high speeds at low cost.

DAC OUT

8k

REF 5 IN

REF GND

19.95k

10 10V SPAN

0.5mA 5k IREF

DAC

20k

IOUT = 4 x I REF x CODE

3

9 IO

DAC OUT

8k

CODE INPUT

The AD565A and AD566A use 12 precision, high-speed bipolar current-steering switches, control amplifier and a laser-trimmed thin-film resistor network to produce a very fast, high accuracy analog output current. The AD565A also includes a buried Zener reference that features low-noise, long-term stability and temperature drift characteristics comparable to the best discrete reference diodes. The combination of performance and flexibility in the AD565A and AD566A has resulted from major innovations in circuit design, an important new high-speed bipolar process, and continuing advances in laser-wafer-trimming techniques (LWT). The AD565A and AD566A have a 10–90% full-scale transition time less than 35 ns and settle to within ± 1/2 LSB in 250 ns max (350 ns for AD566A). Both are laser-trimmed at the wafer level to ± 1/8 LSB typical linearity and are specified to ± 1/4 LSB max error (K and T grades) at +25°C. High speed and accuracy make the AD565A and AD566A the ideal choice for high-speed display drivers as well as fast analog-to-digital converters. The laser trimming process which provides the excellent linearity is also used to trim both the absolute value and the temperature coefficient of the reference of the AD565A resulting in a typical full-scale gain TC of 10 ppm/°C. When tighter TC performance is required or when a system reference is available, the AD566A may be used with an external reference.

6 –VEE

12

24

POWER MSB GND

13 LSB

AD565A and AD566A are available in four performance grades. The J and K are specified for use over the 0°C to +70°C temperature range while the S and T grades are specified for the –55°C to +125°C range. The D grades are all packaged in a 24-pin, hermetically sealed, ceramic, dual-in-line package. The JR grade is packaged in a 28-pin plastic SOIC. PRODUCT HIGHLIGHTS

1. The wide output compliance range of the AD565A and AD566A are ideally suited for fast, low noise, accurate voltage output configurations without an output amplifier. 2. The devices incorporate a newly developed, fully differential, nonsaturating precision current switching cell structure which combines the dc accuracy and stability first developed in the AD562/3 with very fast switching times and an optimally-damped settling characteristic. 3. The devices also contain SiCr thin film application resistors which can be used with an external op amp to provide a precision voltage output or as input resistors for a successive approximation A/D converter. The resistors are matched to the internal ladder network to guarantee a low gain temperature coefficient and are laser-trimmed for minimum full-scale and bipolar offset errors.

  • Covered by Patent Nos.: 3,803,590; RE 28,633; 4,213,806; 4,136,349; 4,020,486; 3,747,088.

REV. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703


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