AD9430-170 Analog Devices, AD9430-170 Datasheet - Page 15

• Manufacturer Part Number: AD9430-170
• Description: 12-Bit, 170/210 MSPS 3.3 V A/D Converter
• Manufacturer: Analog Devices

REV. PrG 4/01/2002
DAC Outputs
Each channel is reconstructed by an on-board dual-channel DAC,
an AD9753. This DAC is intended to assist in debug—it should
not be used to measure the performance of the ADC. It is a current
output DAC with on-board 50 Ω termination resistors. The
figure below is representative of the DAC output with a full-scale
analog input. The scope setting is low bandwidth.
Encode Xtal
An optional xtal oscillator can be placed on the board to serve
as a clock source for the PCB. Power to the xtal is through the
VCLK/VXTAL pin at the power connector. If an oscillator is used,
ensure proper termination for best results. The board has been
tested with a Valpey Fisher VF561 and a Vectron JN00158-163.84.
Test results for the VF561 are shown below.
–100
1
–10
–20
–30
–40
–50
–60
–70
–80
–90
CH1
0
0
ENCODE 163.84MHz
ANALOG 65.02MHz
SNR 63.93dB
SINAD 63.87dB
FUND –0.45dBFS
2ND –85.62dBc
3RD –91.31dBc
4TH –90.54dBc
5TH –90.56dBc
6TH –91.12dBc
THD –82.21dBc
SFDR 83.93dBc
SAMPLES 8k
NOISEFLR –100.44dBFS
WORSTSP –83.93dBc
2.00mV
20
MHz
PRELIMINARY TECHNICAL DATA
40
M 25.0nS
CH1
C1 FREQ
10.33592MHz
C1 PK-PK
448mV
60
248mV
80
-15-
Optional Amplifier
The footprint for transformer T2 can be modified to accept a
wideband differential amplifier (AD8350) for low frequency
applications where gain is required. Note that Pin 2 would need
to be lifted and left floating for operation. Input transformer T1
would need to be modified to a 4:1 for impedance matching and
ADC input filtering would enhance performance (see AD8350
data sheet). SNR/SINAD Performance of 61 dB/60 dB is pos-
sible and would start to degrade at about 30 MHz.
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