10-Bit 40 MSPS
A/D Converter
AD9040A
FEATURES
Low Power: 940 mW
53 dB SNR @ 10 MHz AIN
On-Chip Track-and-Hold, Reference
CMOS Compatible
2 V p-p Analog Input
Fully Characterized Dynamic Performance
OBS
APPLICATIONS
Ultrasound Medical Imaging
Digital Oscilloscopes
Professional Video
Digital Communications
Advanced Television (MUSE Decoders)
Instrumentation
GENERAL DESCRIPTION
FUNCTIONAL BLOCK DIAGRAM
ENCODE
AMP
ARRAY
AIN
GND
VOUT
VREF
T/H
BAND GAP
REFERENCE
T/H
Digital inputs and outputs are CMOS compatible; the analog
input requires a signal of 2 V p-p amplitude. The two-step
architecture used in the AD9040A is optimized to provide the
best dynamic performance available while maintaining low
power requirements of only 940 mW typically; maximum dissipation is 1.1 W at 40 MSPS.
The signal-to-noise ratio (SNR), including harmonics, is 53 dB,
or 8.5 ENOB, when sampling an analog input of 10.3 MHz at
40 MSPS. Competitive devices perform at less than 7.5 ENOB
and require external references and larger input signals.
6-BIT
ADC
5-BIT
ADC
REF
AMP
OLE
The AD9040A is a complete 10-bit monolithic sampling analogto-digital converter (ADC) with on-board track-and-hold (T/H)
and reference. The unit is designed for low cost, high performance applications and requires only an encode signal to achieve
40 MSPS sample rates with 10-bit resolution.
T/H
BPREF
DECODE
LOGIC
AD9040A
ERROR
CORRECTION
DECODE
LOGIC
10
TE
PRODUCT HIGHLIGHTS
1. CMOS compatible logic for direct interface to ASICs.
2. On-board track-and-hold provides excellent high frequency
performance on analog inputs, critical for communications
and medical imaging applications.
3. High input impedance and 2 V p-p input range reduce need
for external amplifiers.
4. Easy to use; no cumbersome external voltage references
required, allowing denser packing of ADCs for multichannel
applications.
5. Available in 28-lead PDIP and SOIC packages.
6. Evaluation board includes AD9040AJR, reconstruction DAC,
and latches. Space is available near the analog input and digital
outputs of the converter for additional circuits. Order as part
number AD9040A/PCB (schematic shown in data sheet).
The AD9040A A/D converter is available in either a 28-lead
PDIP or a 28-lead SOIC package. The two models operate over
a commercial temperature range of 0°C to 70°C. Contact the
factory regarding availability of ceramic military temperature
range devices.
REV. D
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