AD7112*

Features:

Dynamic Range: 88.5 dB
Resolution: 0.375 dB
On-Chip Data Latches for Both DACs
Four-Quadrant Multiplication
+5 V Operation
Pin Compatible with AD7528
Low Power


Application

Audio Attenuators
Sonar Systems
Function Generators


Pinout




Specifications

V_DD to AGND or DGND  . . . . . . . . . . . . . . . . . . 0.3 V, +7 V
AGND to DGND  . . . . . . . . . . . . . . . . . . 0.3 V, V_DD + 0.3 V
Digital Inputs to DGND  . . . . . . . . . . . . 0.3 V, V_DD + 0.3 V
OUT A, OUT B to AGND  . . . . . . . . . . .   0.3 V, V_DD + 0.3 V
V_IN A, V_IN B to AGND  . . . . . . . . . . . . . . . . . . . . . . . .±25 V
V_RFB A, V_RFB B to AGND  . . . . . . . . . . . . . . . . . . . . . .±25 V
Operating Temperature Range
All Versions  . . . . . . . . . . . . . . . . . . . . . . . 40°C to +85°C
Junction Temperature  . . . . . . . . . . . . . . . . . . . . . .+150°C
Storage Temperature  . . . . . . . . . . . . . . 65°C to +150°C
Power Dissipation, DIP  . . . . . . . . . . . . . . . . . . . . . . . .1 W
_JA, Thermal Impedance  . . . . . . . . . . . . . . . . . . .102°C/W


Description

The LOGDAC® AD7112 is a monolithic dual multiplying D/A converter featuring wide dynamic range and excellent DAC-to- DAC matching. Both DACs can attenuate an analog input signal over the range 0 dB to 88.5 dB in 0.375 dB steps. It is available in skinny 0.3" wide 20-pin DIPs and in 20-terminal surface mount packages.

The AD7112 is easily interfaced to a standard 8-bit MPU bus via an 8-bit data port and standard microprocessor control lines. It should be noted that the AD7112 is exactly pin-compatible with the AD7528, an industry standard dual 8-bit multiplying DAC. This allows an easy upgrading of existing AD7528 de- signs which would benefit both from the wider dynamic range and the finer step resolution offered by the AD7112. The AD7112 is fabricated in Linear Compatible CMOS (LC2 MOS), an advanced, mixed technology process that combines precision bipolar circuits with low power CMOS logic.