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AD9040A Arkusz danych(PDF) 9 Page - Analog Devices

Numer części AD9040A
Szczegółowy opis  10-Bit 40 MSPS A/D Converter
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Strona internetowa  http://www.analog.com
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AD9040A Arkusz danych(HTML) 9 Page - Analog Devices

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REV. D
AD9040A
–9–
Some applications may require greater accuracy, improved
temperature performance, or adjustment of the gain (input
range) of the AD9040A, which cannot be obtained by using the
internal reference. For these applications, an external 2.5 V
reference can be used, as shown in Figure 4. The VREF input
requires 5
µA of drive current.
REF
AMP
BAND GAP
REFERENCE
REFERENCE
AD9040A
VOUT
VREF
–VS
BPREF
REFERENCE
0.1 F
0.1 F
Figure 4. Using External Reference
In applications using multiple AD9040As, slaving the reference
inputs to a single reference output will improve gain tracking
among the ADCs, as shown in Figure 5.
VOUT
VREF
AD9040A
–VS
–VS
–VS
VREF
AD9040A
VREF
0.1 F
0.1 F
0.1 F
0.1 F
0.1 F
0.1 F
AD9040A
BPREF
BPREF
BPREF
Figure 5. Slaving Multiple AD9040As to a Single
Internal Reference
In the Specifications table, the gain temperature coefficient
parameter under dc accuracy applies to the ADC when the inter-
nal reference is being used. If an external reference is used, its
temperature coefficient must be taken into account to deter-
mine overall temperature performance.
The input range can be varied by adjusting the reference voltage
applied to the AD9040A. By decreasing the reference voltage,
the gain can be reduced approximately 10% with no degrada-
tion in performance. Increasing the reference voltage increases
the gain, but for proper operation, the reference voltage should
not exceed 2.6 V.
Time-Gain Control ADC
Ultrasound and sonar systems require an increase in gain versus
time. This allows the system to correct for attenuation of return
pulses. Figure 6 shows the AD600/AD602 amplifier and the
AD9040A ADC configured as a time-gain control analog-to-
digital converter. The control voltage ramps from –625 mV to
+625 mV, permitting 40 dB of gain-control range. The voltage
used for gain control can be either a linear ramp or the output
of a voltage-output DAC, such as the AD7242.
–625mV
+625mV
GAIN CONTROL
VOLTAGE
AD600/AD602
A1H1
AD9040A
Figure 6. Ultrasound/Sonar Time-Gain Control
ADC using X-AMP™
Transient Response
Figure 7 illustrates the method for evaluating ADC transient
performance. Two synthesizers are locked in synchronization
but tuned to frequencies that are slightly offset from a 2 to 1
submultiple.
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
the TPCs in this data sheet.
AD9040A
MARCONI 2030
SYNTHESIZER
REF
MARCONI 2030
SYNTHESIZER
REF
19.9609375MHz
40MHz
FLAT PULSE
NETWORK
SINE
TO
CMOS
ANALOG
IN
ENCODE
OUTPUT
Figure 7. Transient Response Test


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