AD7115_15 Datasheet, PDF (1/8 Pages) Analog Devices – CMOS 0.1DB STEP ATTENUATOR

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ANALOG
8 ^{W DEVICES}
LOGDACTM
CMOS0.1dBStep Attenuator
FEATURES
Dynamic Range: 0 to 19.9dB Plus Full Muting
Resolution: O.1dB
2 1/2 Digit BCD Input Coding
On-Chip Data latches
Full %25V Input Range
low Distortion and Noise
latch-Up Free (No Protection Schottky Required)
TTl Compatible
APPLICATIONS
Audio Attenuators
Function Generators
Test Equipment
8 Digitally Controlled AGC Systems
OB GENERAL DESCRIPTION
The AD7115 is a digitally programmable attenuator which at-
S _{tenuates an analog input signal over the range 0 to -19.9dB in}
O O.ldB steps.
The degree of attenuation is controlled by a 2 1/2 digit BCD coded
8 ^{L input word which is latched into on-chip data latches using}
E microprocessor compatible control signals WR, LBEN and
HBEN. Operating frequency range of the device is from dc to
TE _{several hundred kHz.}
FUNCTIONAL DIAGRAM
The device is packaged in an 18-pin dual-in-line plastic, cerdip
or ceramic package.
PRODUCT HIGHLIGHTS
1. High resolution O.ldB steps from 0 to 19.9dB with step ac-
curacies better than:t O.O4dBallow precision attenuators and
other special purpose function generators to be built at low
8
cost.
2. A resolution of O.ldB is equivalent to step sizes of 1% of read-
PIN CONFIGURATION
mg.
3. The 2 1/2 digit BCD input code can be loaded into the on-chip
latches in one WRITE operation. Alternatively, for use with
an 8-bit data bus, data can be loaded in two WRITE operations
by using byte enable signals HBEN and LBEN.
4. The AD7115 can be used in series with standard attenuator
blocks to position its attenuation range as required, e.g., - 40dB
to - 60dB in O.ldB steps.
5. Analog input signal can be up to :t25V with VDD = +5V.
HBEN 14
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D8ls
071-
AD7'!S
TOP VIEW
(NOT TO SCALE)
0617
'.0 DIGIT
0518
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8
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