CS4373 Datasheet, PDF (1/20 Pages) Cirrus Logic – Low-power, High-performance Delta-Sigma Test DAC

CS4373
Low-power, High-performance ∆Σ Test DAC
Features
• Digital ∆Σ Input, Differential Analog Output
• Selectable Differential Outputs (OUT±, BUF±)
• Selectable Output Attenuation
- 1, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64
• User-programmable Test Modes
- Differential
- Common mode
• Output Voltage: 5 V_P-P Differential
• Outstanding Noise Performance
- 114 dB SNR @ 430 Hz bandwidth
• Low Total Harmonic Distortion
- OUT±: -118 dB THD typical, -112 dB THD max
- BUF±: -100 dB THD typical, -95 dB THD max
• Low Power Consumption
- Normal mode: 7.8 mA
- Low power mode: 5.0 mA
- Power down: 400 µA
- Sleep mode: 2 µA
• Power Supply Options
- VA+ = +5 V; VA- = 0 V; VD = +3.3 V to +5 V
- VA+ = +2.5 V; VA- = -2.5 V; VD = +3.3 V
Description
The CS4373 is a differential output digital-to-
analog converter intended for high-resolution,
low-frequency measurement systems. It is de-
signed to work with the CS5376A and CS5378
digital filters, the CS3301 and CS3302 high-pre-
cision amplifiers, and the CS5371 or CS5372
high-performance ∆Σ modulators.
The CS4373 includes a set of multiplexed out-
puts which provide a precision output (OUT±) for
testing the electronics channel and a buffered
output (BUF±) for in-circuit sensor tests. It is driv-
en by a ∆Σ bitstream and the maximum analog
output is differential 5 volts peak-to-peak. Distor-
tion performance of the DAC is typically -118 dB
THD from the precision output, and -100 dB THD
from the buffered output. Noise performance is
114 dB SNR over a 430 Hz bandwidth.
The CS4373 has very low power consumption. In
normal mode (LPWR=0; MCLK=2.048 MHz),
power consumption is 40 mW; while in Low Pow-
er mode (LPWR=1; MCLK=1.024 MHz), power
consumption is 25 mW.
ORDERING INFORMATION
See page 19.
VA+
MODE(0, 1, 2)
ATT(0, 1, 2)
TDATA
LPW R
MCLK
SYNC
VA-
24-bit ∆Σ
DAC
Attenuator
Clock
Generator
VREF+ VREF-
VD
OUT+
OUT-
BUF+
BUF-
CAP+
CAP-
DGND
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