AD9040A Analog Devices, Inc., AD9040A Datasheet

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AD9040A

Manufacturer Part Number
AD9040A
Description
10-bit 40 Msps A/d Converter
Manufacturer
Analog Devices, Inc.
Datasheet

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a
GENERAL DESCRIPTION
The AD9040A is a complete 10-bit monolithic sampling analog-
to-digital converter (ADC) with on-board track-and-hold 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.
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 dissi-
pation is 1.1 watt 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.
The AD9040A A/D converter is available as either a 28-lead
plastic DIP or a 28-lead SOIC. 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. B
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FEATURES
Low Power: 940 mW
53 dB SNR @ 10 MHz A
On-Chip T/H, Reference
CMOS-Compatible
2 V p-p Analog Input
Fully Characterized Dynamic Performance
APPLICATIONS
Ultrasound Medical Imaging
Digital Oscilloscopes
Professional Video
Digital Communications
Advanced Television (MUSE Decoders)
Instrumentation
IN
PRODUCT HIGHLIGHTS
1. CMOS compatible logic for direct interface to ASICs.
2. On-board T/H provides excellent high frequency perfor-
3. High input impedance and 2 volt p-p input range reduce
4. Easy to use; no cumbersome external voltage references
5. Available in 28-lead plastic DIP and SOIC packages.
6. Evaluation board includes AD9040AJR, reconstruction
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
GND
mance on analog inputs, critical for communications and
medical imaging applications.
need for external amplifiers.
required, allowing denser packing of ADCs for multichannel
applications.
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).
BP
V
V
OUT
REF
REF
A
IN
REFERENCE
BANDGAP
FUNCTIONAL BLOCK DIAGRAM
AD9040A
ENCODE
AMP
REF
T/H
World Wide Web Site: http://www.analog.com
5-BIT
ADC
DECODE
LOGIC
T/H
10-Bit 40 MSPS
A/D Converter
CORRECTION
© Analog Devices, Inc., 1999
ERROR
AD9040A
ARRAY
AMP
6-BIT
ADC
DECODE
LOGIC
10

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AD9040A Summary of contents

Page 1

... MSPS sample rates with 10-bit resolution. Digital inputs and outputs are CMOS compatible; the analog input requires a signal 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 dissi- pation is 1 ...

Page 2

... + + + + + + + + +25 C III +25 C III –2– AD9040AJN/JR Typ Max Units 10 Bits 1.0 2.0 LSB 2.5 LSB 1.0 2.0 LSB 2.5 LSB Guaranteed 0.5 1 ppm p ...

Page 3

... ANALOG –V DIGITAL INPUTS . . . . . . . . . . . . . . . . . . . . . . . . . Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . REF Digital Output Current . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Operating Temperature AD9040AJN/ +70 C Storage Temperature . . . . . . . . . . . . . . . . . – +150 C Maximum Junction Temperature S Lead Soldering Temp (10 sec +300 C NOTES 1 Absolute maximum ratings are limiting values to be applied individually, and beyond which the serviceability of the circuit may be impaired ...

Page 4

... D0 (LSB GND GND OUT REF D AD9040A GND REF TOP VIEW (Not to Scale) NC – ENCODE GND – (MSB ...

Page 5

... Two-Tone Intermodulation Distortion (IMD) Rejection The ratio of the power of either of two input signals to the power of the strongest third-order IMD signal 2.5k 6.8k BP REF GND V SS Figure 2. Equivalent Circuits –5– AD9040A OUT D0 GND GND BANDGAP OUTPUT CMOS OUTPUT ...

Page 6

... ENCODE command. The conversion process begins on the rising edge of this pulse, which should have a 50% ( 10%) duty cycle. Minimum encode rate of the AD9040A is 10 MSPS because of the use of three internal T/H devices. The held analog value of the first track-and-hold is applied to a 5-bit flash converter and a pair of internal T/Hs (shown in the block diagram as a single unit) ...

Page 7

... One synthesizer clocks a flat pulse network at a frequency of 19.9609375 MHz to provide the analog input signal; the other synthesizer output is shaped to provide a CMOS 40 MHz sam- pling clock. At the output of the AD9040A, output data reflects an interleaved alias of the input pulse. The repetitive sampling allows the measurement of ADC transient response as shown in performance graphs elsewhere in this data sheet ...

Page 8

... AD9040A should be connected to the analog ground plane. The power supplies of the AD9040A should be isolated from the supplies used for external devices; this reduces the amount of noise coupled into the ADC. The digital +5 volt connection ...

Page 9

... Figure 8. PCB Top View DAC Reconstruction The AD9040A evaluation board provides an onboard AD9721 reconstruction DAC for observing the digitized analog input signal. The AD9721 is terminated into 51 ohms to provide p-p signal at the output (RC OUTPUT). Output Data The output data bits are latched with a CMOS 74AC574 which drives a 40-pin connector (AMP p/n 102153-9) ...

Page 10

... C10 0.1 F 0.1 F 0 74AC574 AD9040AJR REF OUT R18 100 (MSB R17 100 ENC 74AC574 D8 D8 – R16 100 ...

Page 11

... FREQUENCY – MHz Figure 18. 0 ENCODE = 40.5 MSPS ANALOG IN = 2.3 MHz SNR = 55.20 dB SNR (w/o har.) = 55.90 dB 2nd HARMONIC = –75.1 dB 3rd HARMONIC = –73.2 dB –65 0 10.1 20.2 FREQUENCY – MHz Figure 21. –11– AD9040A 10.3 MHz CLOCK RATE – MSPS Figure 13. SNR vs. Clock Rate ...

Page 12

... AD9040A 28-Lead Plastic DIP (N-28) 1.565 (39.70) 1.380 (35.10 PIN 1 0.250 (6.35) MAX 0.022 (0.558) 0.100 0.070 (1.77) (2.54) 0.014 (0.356) MAX BSC 0.625 (15.87) 0.600 (15.24) 0.015 (0.381) 0.008 (0.204) OUTLINE DIMENSIONS Dimensions shown in inches and (mm) 15 0.550 (13.97) 0.530 (13.46) 14 0.015 (0.38) MIN 0.140 (3.55) MIN SEATING PLANE 0.012 (0.30) 0.004 (0.10) ...

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