AD9040A Analog Devices, Inc., AD9040A Datasheet - Page 9

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

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 a
1 V 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). The data and
clock signals are available on the connector per the pin assign-
ments shown on the schematic of the evaluation board. Output
data are available on the falling edge of the clock.
REV. B
Figure 8. PCB Top View
–9–
Analog
Input
+1.002 V Positive Full Scale + 1 LSB 1
+1 V
+1/2 V
0 V
–1/2 V
–1 V
–1.002 V
Voltage
Level
Full Scale – 1 LSB
1/2 Scale – 1 LSB
Bipolar Zero
1/2 Scale + 1 LSB
Negative 1/2 Scale
Full Scale + 1 LSB
Negative Full Scale
Negative Full Scale – 1 LSB 1
Positive Full Scale
Positive 1/2 Scale
Figure 9. PCB Bottom View
Table II. Digital Coding
Out-of-
Range
0
0
0
0
0
0
0
0
0
0
AD9040A
Digital Output
MSB . . . LSB
1111111111
1111111111
1111111110
1100000000
1011111111
10000000000
01111111111
0100000000
0011111111
0000000001
0000000000
0000000000