ML2008 Datasheet, PDF (1/11 Pages) Micro Linear Corporation – μP Compatible Logarithmic Gain/Attenuator

March 1997
ML2008*, ML2009**
µP Compatible Logarithmic Gain/Attenuator
GENERAL DESCRIPTION
The ML2008 and ML2009 are digitally controlled
logarithmic gain/attenuators with a range of –24 to +24dB
in 0.1dB steps.
Easy interface to microprocessors is provided by an input
latch and control signals consisting of chip select and
write.
The interface for gain setting of the ML2008 is by an 8-bit
data word, while the ML2009 is designed to interface to a
16-bit data bus with a single write operation by hard-
wiring the gain/attenuation pin or LSB pin. The ML2008
can be power downed by the microprocessor utilizing a
bit in the second write operation.
Absolute gain accuracy is 0.05dB max over supply
tolerance of ±10% and temperature range.
These CMOS logarithmic gain/attenuators are designed for
a wide variety of applications in telecom, audio, sonar or
general purpose function generation.
FEATURES
s Low noise
0dBrnc max with +24dB gain
s Low harmonic distortion
–60dB max
s Gain range
–24 to +24dB
s Resolution
0.1dB steps
s Flat frequency response
±0.05dB from 0.3-4kHz
±0.10dB from 0.1-20kHz
s Low supply current
4mA max from ±5V supplies
s TTL/CMOS compatible digital interface
s ML2008 is designed to interface to an 8-bit data bus;
ML2009 to 16-bit data bus
* This Part Is End Of Life As Of August 1, 2000
** This Part Is Obsolete
BLOCK DIAGRAM
ML2008
ML2009*
VCC VSS GND AGND
VCC VSS GND AGND
+5
V_IN
WR
CS
A0
–5
+
COARSE
–
RESISTORS/
SWITCHES
16
+
FINE
–
RESISTORS/
SWITCHES
16
+
BUFFER
–
VOUT
DECODERS
8
REGISTER 0
1
PDN
1
REGISTER 1
8
D1–D8
+5
V_IN
WR
CS
–5
+
COARSE
–
+
FINE
–
RESISTORS/
SWITCHES
16
RESISTORS/
SWITCHES
16
DECODERS
9
REGISTER 0
9
D0–D8
+
BUFFER
–
VOUT
1