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AD9040A Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD9040A
Beschreibung 10-Bit 40 MSPS A/D Converter
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
AD9040A Datasheet, Funktion
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
AIN
GND
FUNCTIONAL BLOCK DIAGRAM
ENCODE
T/H
AMP
ARRAY
T/H T/H
APPLICATIONS
Ultrasound Medical Imaging
Digital Oscilloscopes
Professional Video
Digital Communications
Advanced Television (MUSE Decoders)
OInstrumentation
VOUT
BAND GAP
REFERENCE
5-BIT
ADC
6-BIT
ADC
VREF
BPREF
REF
AMP
AD9040A
DECODE
LOGIC
ERROR
CORRECTION
DECODE
LOGIC
10
BSOGENERAL DESCRIPTION
The AD9040A is a complete 10-bit monolithic sampling analog-
Lto-digital converter (ADC) with on-board track-and-hold (T/H)
and reference. The unit is designed for low cost, high perfor-
Emance applications and requires only an encode signal to achieve
T40 MSPS sample rates with 10-bit resolution.
EDigital inputs and outputs are CMOS compatible; the analog
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.
input requires a signal of 2 V p-p amplitude. The two-step
4. Easy to use; no cumbersome external voltage references
architecture used in the AD9040A is optimized to provide the
required, allowing denser packing of ADCs for multichannel
best dynamic performance available while maintaining low
applications.
power requirements of only 940 mW typically; maximum dissi-
5. Available in 28-lead PDIP and SOIC packages.
pation is 1.1 W at 40 MSPS.
6. Evaluation board includes AD9040AJR, reconstruction DAC,
and latches. Space is available near the analog input and digital
The signal-to-noise ratio (SNR), including harmonics, is 53 dB,
outputs of the converter for additional circuits. Order as part
or 8.5 ENOB, when sampling an analog input of 10.3 MHz at
number AD9040A/PCB (schematic shown in data sheet).
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 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
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved.






AD9040A Datasheet, Funktion
AD9040A
DEFINITIONS OF SPECIFICATIONS
Maximum Conversion Rate
Analog Bandwidth
The encode rate at which parametric testing is performed.
The analog input frequency at which the spectral power of the
fundamental frequency (as determined by FFT analysis) is
reduced by 3 dB.
Output Propagation Delay
The delay between the 50% point of the falling edge of the encode
command and the 1 V/4 V points of output data.
Aperture Delay
The delay between the rising edge of the encode command and
the instant at which the analog input is sampled.
Overvoltage Recovery Time
The amount of time required for the converter to recover to
10-bit accuracy after an analog input signal 150% of full scale is
Aperture Uncertainty (Jitter)
reduced to the full-scale range of the converter.
The sample-to-sample variation in aperture delay.
Power Supply Rejection Ratio (PSRR)
Differential Gain
The ratio of a change in input offset voltage to a change in power
The percentage of amplitude change of a small high frequency
supply voltage.
sine wave (3.58 MHz) superimposed on a low frequency signal
(15.734 kHz).
Differential Nonlinearity
The deviation of any code from an ideal 1 LSB step.
Differential Phase
The phase change of a small high frequency sine wave (3.58 MHz)
Osuperimposed on a low frequency signal (15.734 kHz).
BHarmonic Distortion
The rms value of the fundamental divided by the rms value of
Sthe harmonic.
OIntegral Nonlinearity
The deviation of the transfer function from a reference line
Lmeasured in fractions of 1 LSB using a “best straight line”
Edetermined by a least square curve fit.
TMinimum Conversion Rate
EThe encode rate at which the SNR of the lowest analog signal
Signal-to-Noise Ratio (SNR)
The ratio of the rms signal amplitude to the rms value of noise,
which is defined as the sum of all other spectral components,
including harmonics but excluding dc, with an analog input
signal 1 dB below full scale.
Signal-to-Noise Ratio (Without Harmonics)
The ratio of the rms signal amplitude to the rms value of noise,
which is defined as the sum of all other spectral components,
excluding the first eight harmonics and dc, with an analog input
signal 1 dB below full scale.
Transient Response
The time required for the converter to achieve 10-bit accuracy
when a step function is applied to the analog input.
Two-Tone Intermodulation Distortion (IMD) Rejection
The ratio of the power of either of the two input signals to the
power of the strongest third order IMD signal.
frequency tested drops by no more than 3 dB below the guar-
anteed limit.
VCC
1k
1k
AIN
2k
1mA
1mA
VSS
ANALOG INPUT
VCC
1k
1k
VREF
6.8k
GND
RL
2.5k
BPREF
VCC
VOUT
RL
GND
REFERENCE CIRCUIT
VSS
BAND GAP OUTPUT
Figure 2. Equivalent Circuits
VCC
D0-D9
GND
CMOS OUTPUT
–6– REV. D

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AD9040A pdf, datenblatt
AD9040A
Analog Input
+1.002 V
+1 V
Table II. Digital Coding
Voltage Level
Out-of-Range
Positive Full Scale + 1 LSB
Positive Full Scale
Full Scale – 1 LSB
1
0
0
Digital Output
MSB . . . LSB
1111111111
1111111111
1111111110
+1/2 V
Positive 1/2 Scale
1/2 Scale – 1 LSB
0
0
1100000000
1011111111
0V
–1/2 V
OB–1V
SOLETE–1.002V
Bipolar Zero
1/2 Scale + 1 LSB
Negative 1/2 Scale
Full Scale + 1 LSB
Negative Full Scale
Negative Full Scale – 1 LSB
0
0
0
0
0
0
1
10000000000
01111111111
0100000000
0011111111
0000000001
0000000000
0000000000
–12–
REV. D

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