AD7111A

Features:

Dynamic Range: 88.5 dB
Resolution: 0.375 dB
On-Chip Data Latches
+5 V Operation
AD7111A Pin Compatible with AD7524
Low Power


Application

Audio Attenuators
Sonar Systems
Function Generators
Digitally Controlled AGC System


Pinout




Specifications

V_DD (to DGND)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7 V
V_IN (to AGND)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±35 V
Digital Input Voltage to DGND  . . . . .    0.3 V to V_DD + 0.3 V
I_OUT to AGND . . . . . . . . . . . . . . . . . . . . . . . . . .0.3 V to V_DD
V_RFB to AGND  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±35 V
AGND to DGND  . . . . . . . . . . . . . . . . . . . . . . . . . . .   0 to V_DD
DGND to AGND  . . . . . . . . . . . . . . . . . . . . . . . . . . .   0 to V_DD
Power Dissipation, DIP  . . . . . . . . . . . . . . . . . . . . . . . . . 1 W
_JA, Thermal Impedance . . . . . . . . . . . . . . . . . . . .  117°C/W
Lead Temperature (Soldering, 10 secs)  . . . . . . . . .  +300°C
Power Dissipation, SOIC . . . . . . . . . . . . . . . . . . . . . . . . .1 W
_JA, Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 75°C/W
Lead Temperature (Soldering)
Vapor Phase (60 secs)  . . . . . . . . . . . . . . . . . . . . . . .  215°C
Infrared (15 secs)  . . . . . . . . . . . . . . . . . . . . . . . . . .   220°C


Description

The LOGDAC AD7111/AD7111A are monolithic multiplying D/A converters featuring wide dynamic range in a small pack- age. Both DACs can attenuate an analog input signal over the range 0 dB to 88.5 dB in 0.375 dB steps. They are available in 16-pin DIPs and SOIC packages. The AD7111 is also available
in a 20-terminal LCCC package. The degree of attenuation across the DAC is determined by an 8-bit word applied to the onboard decode logic. This 8-bit word is decoded into a 17-bit word which is then applied to a 17-bit R-2R ladder. The very fine step resolution, which is available over the entire dynamic range, is due to the use of this 17-bit DAC.

The AD7111/AD7111A are fabricated in Linear Compatible CMOS (LC2 MOS), an advanced, mixed technology process that combines precision bipolar circuits with low power CMOS logic.