Dual 12-Bit, High Bandwidth, Multiplying DAC with
4-Quadrant Resistors and Parallel Interface

AD5405


Rev. 0
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FEATURES
On chip 4-quadrant resistors allow flexible output ranges
10 MHz multiplying bandwidth
Fast parallel interface write cycle: 58 MSPS
2.5 V to 5.5 V supply operation
±10 V reference input
Extended temperature range: −40°C to 125°C
40-lead LFCSP package
Guaranteed monotonic
4-quadrant multiplication
Power-on reset
Readback function
.5 µA typical current consumption
APPLICATIONS
Portable battery-powered applications
Waveform generators
Analog processing
Instrumentation applications
Programmable amplifiers and attenuators
Digitally-controlled calibration
Programmable filters and oscillators
Composite video
Ultrasound
Gain, offset, and voltage trimming
GENERAL DESCRIPTION
The AD5405
1
is a dual CMOS, 12-bit, current output digital-
to-analog converter (DAC).This device operates from a 2.5 V to
5.5 V power supply, making it suited to battery-powered and
other applications.
The applied external reference input voltage (VREF) determines
the full-scale output current. An integrated feedback resistor
(RFB) provides temperature tracking and full-scale voltage
output when combined with an external I-to-V precision
amplifier. This device also contains all the 4-quadrant resistors
necessary for bipolar operation and other configuration modes.
This DAC utilizes data readback, allowing the user to read the
contents of the DAC register via the DB pins. On power-up, the
internal register and latches are filled with zeros and the DAC
outputs are at zero scale.
As a result of manufacture with a CMOS submicron process, the
device offers excellent 4-quadrant multiplication characteristics,
with large signal multiplying bandwidths of up to 10 MHz.
The AD5405 has a 6 mm × 6 mm, 40-lead LFCSP package.

1
US Patent Number 5,689,257.

V
REF
A
AD5405
V
REF
B
V
DD
DB0
DB11
DATA
INPUTS
DAC A/B
CS
R/W
GND
CONTROL
LOGIC
INPUT
BUFFER
LATCH
I
OUT
1B
I
OUT
1A
12-BIT
R-2R DAC A
R
FB
A
POWER-ON
RESET
12-BIT
R-2R DAC B
LATCH
R1
2R
R1A
R2
2R
R3
2R
R3A R2AR2_3A
R2
2R
R3
2R
R3B R2BR2_3B
RFB
2R
R1
2R
RFB
2R
R1B
I
OUT
2A
I
OUT
2B
LDAC
04463-0-001
R
FB
B

Figure 1. AD5405 Functional Block Diagram