Datasheet AD580 (Analog Devices) - 7

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AD580 THE AD580 AS A LOW POWER, LOW VOLTAGE,
output amplifier is also low power, requiring only 2.5 mA
PRECISION REFERENCE FOR DATA CONVERTERS
quiescent current. Its laser-trimmed offset voltage preserves the ±1/2 LSB linearity of the AD7542KN without user trims, and it The AD580 has a number of features that make it ideally suited typically settles to ±1/2 LSB in less than 3 µs. It will provide the for use with A/D and D/A data converters used in complex 0 V to –2.5 V output swing from ±5 V supplies. microprocessor-based systems. The calibrated 2.500 V output minimizes user trim requirements and allows operation from a
+5V
single, low voltage supply. Low power consumption (1 mA
+E
quiescent current) is commensurate with that of CMOS-type
EOUT AD580
devices, while the low cost and small package complements the
GAIN –E 500
Ω
ADJUST SYSTEM V V DD REF
decreasing cost and size of the latest converters.
8-BIT DATA BUS 200
Ω
14 15 RFB 22pF D0 16 7 I D1 OUT1 6 1
Figure 12 shows the AD580 used as a reference for the AD7542
D2 I ANALOG 5 AD7542 2 OUT2 AD544L INPUT D3 4 3
12-bit CMOS DAC with complete microprocessor interface.
13 10 11 9 8 12 AGND –5V
The AD580 and the AD7542 are specified to operate from a
AD7 AD0 CLR A0 A1 WR CS FROM SYSTEM RESET
single 5 V supply, thus eliminating the need to provide a 15 V
DGND A0 FROM ADDRESS BUS
power supply for the sole purpose of operating a reference. The
A1
012 B-
FROM WR
AD7542 includes three 4-bit data registers, a 12-bit DAC
FROM ADDRESS DECODER
00525- register, and address decoding logic. It may thus be interfaced Figure 12. Low Power, Low Voltage Reference for the AD7542 Microprocessor-Compatible, 12-Bit DAC directly to a 4-, 8- or 16-bit data bus. Only 8 mA of quiescent current from the single 5 volt supply is required to operate the AD7542 which is packaged in a small, 16-pin DIP. The AD544 Rev. B | Page 7 of 8 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS AD580 CHIP DIMENSIONS AND PAD LAYOUT ESD CAUTION THEORY OF OPERATION VOLTAGE VARIATION VERSUS TEMPERATURE NOISE PERFORMANCE THE AD580 AS A CURRENT LIMITER THE AD580 AS A LOW POWER, LOW VOLTAGE, PRECISION REFERENCE F OUTLINE DIMENSIONS ORDERING GUIDE