AD604-EVAL Analog Devices Inc, AD604-EVAL Datasheet - Page 25

• Manufacturer Part Number: AD604-EVAL
• Description: BOARD EVALUATION FOR AD604
• Manufacturer: Analog Devices Inc

Specifications of AD604-EVAL

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PREAMPLIFIER GAIN
The default gain of the preamplifier is 20 dB, 14 dB is achieved
with 0 Ω resistors in the R11and R12 positions. The 14 dB and
20 dB preset gains are accurate because of the close matching of
the internal thin film resistors. The gain accuracy after installing
external resistors is subject to inherent tolerance of absolute
accuracy; however, any pair of preamplifiers is reasonably
matched when standard 1% SM resistors are used.
OUTPUTS
The DSX outputs are available on the OUT1 and OUT2 SMA
connectors and are series terminated with decoupling capacitors
and 49.9 Ω series resistors.
Table 5. Jumpers
Switch
VG1−IN
VG1+IN
CH1
CH2
VG2+IN_SW
VG2−IN
GN1
REF
OCMV
Function
Connects –DSX1 to the SMA connector VGA1−IN or to ground.
Connects +DSX1 (ac-coupled) to the preamplifier output of Channel 1 (PAO1) or to the SMA connector VGA1+ IN.
Enables/disables Channel 1 preamp by connecting COM1 to ground (enable) or to +5V (disable).
Enables/disables Channel 2 preamp by connecting COM2 to ground (enable) or to +5V (disable).
Connects the +DSX input to the SMA VGA2+IN, the Channel 2 preamplifier output (PAO2), or the output of Channel 1 for
a cascade connection.
Connects –DSX2 to SMA VGA2−IN or to ground.
Connects the VGN1 input to trimmer GN1_ADJ gain adjust wiper or leaves the input unconnected.
Connects the reference input to the VREF_ADJ trimmer or leaves the input connected.
Connects VOCM to the common-mode voltage trimmer, VOCM_ADJ.
GENERATOR SINE
FUNCTION
Figure 57. A Representative Test Setup of the AD604-EVALZ
INPUT
Rev. G | Page 25 of 32
POWER SUPPLY
DC OPERATING CONDITIONS
Table 4 lists the trimmers and their functions provided for
convenient dc level adjustments of gain, reference voltage, and
output common-mode voltage. Table 5 lists the switches and
their functions.
Table 4. Trimmer Functions
Trimmer
GN1_ADJ
VREF_ADJ
VOCM_ADJ
GN2_ADJ
OSCILLOSCOPE TO
MONITOR VOUT
Function
Optional dc level for VGA Channel 1
Optional dc level to adjust reference voltage
Output common-mode voltage adjustment
Optional dc level for VGA Channel 2
AD604