Datasheet

ManualsBrandsANALOG DEVICES ManualsData collecting ICsData acquisition IC - DA converter (DAC) PLCC 20

Summary of content (6 pages)

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AD557–SPECIFICATIONS (@ T = 25ⴗC, V A Min Typ RESOLUTION RELATIVE ACCURACY 0°C to 70°C ± 1/2 Unit 8 Bits 1 LSB 0 to 2.56 V mA 5 Internal Passive Pull-Down to Ground 2 OUTPUT SETTLING TIME 3 0.8 1.5 µs FULL-SCALE ACCURACY 4 @ 25°C TMIN to TMAX ± 1.5 ± 2.5 ± 2.5 ± 4.0 LSB LSB ±1 ±3 LSB LSB ZERO ERROR @ 25°C TMIN to TMAX Guaranteed But Not Tested ⴞ100 µA PIN CONFIGURATIONS 2.0 0 V V DIP 0.8 2.0 0 0.
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AD557 CIRCUIT DESCRIPTION The AD557 consists of four major functional blocks fabricated on a single monolithic chip (see Figure 1). The main D/A converter section uses eight equally weighted laser-trimmed current sources switched into a silicon-chromium thin-film R/2R resistor ladder network to give a direct but unbuffered 0 mV to 400 mV output range. The transistors that form the DAC switches are PNPs; this allows direct positive-voltage logic interface and a zero-based output range.
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AD557 APPLICATIONS Grounding and Bypassing Timing and Control All precision converter products require careful application of good grounding practices to maintain full rated performance. Because the AD557 is intended for application in microcomputer systems where digital noise is prevalent, special care must be taken to assure that its inherent precision is realized. The AD557 has two ground (common) pins; this minimizes ground drops and noise in the analog signal path.
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AD557 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). N-16 (Plastic) Package 0.87 (22.1) MAX 0.25 0.31 (6.35) (7.87) 0.035 (0.59) 0.18 (4.57) 0.18 (4.57) MAX 0.125 (3.18) MIN 0.018 (0.46) 0.033 (0.84) 0.011 (0.28) 0.3 (7.62) 0.1 (2.54) P-20A (PLCC) Package 0.390 ⴞ 0.005 SQ (9.906 ⴞ 0.125) 0.353 ⴞ 0.003 SQ (8.966 ⴞ 0.076) 0.173 ⴞ 0.008 (4.385 ⴞ 0.185) 0.105 ⴞ 0.015 (2.665 ⴞ 0.375) 0.020 (0.51) MIN 0.045 ⴞ 0.003 (1.143 ⴞ 0.076) 0.035 ⴞ 0.01 (0.89 ⴞ 0.25) NO.1 PIN IDENTIFIER 0.029 ⴞ 0.
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AD557–Revision History Location Page Data sheet changed from REV. A to REV. B. PRINTED IN U.S.A. C00512a–0–1/01 (rev. B) Changes to MONOTONICITY section of spec. page . . . . . . . . . 2 –6– REV.