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6
dc2365afa
DEMO MANUAL DC2365A
DC2365A SETUP
DC Power
The DC2365A requires ±16VDC and draws +80mA/–6mA.
Most of the supply current is consumed by the CPLD,
regulators and discrete logic on the board. The ±16VDC
input voltage powers the ADC through LT1763 and LT1964
regulators which provide protection against accidental
reverse bias. Additional regulators provide power for the
CPLD and external reference.
Clock Source
You must provide a low jitter 2.5VP-P sine or square wave
to the clock input, J1. The clock input is AC coupled so the
DC level of the clock signal is not important. A generator
such as the Rohde & Schwarz SMB100A high speed clock
source is recommended to drive the clock input. Even a
good generator can start to produce noticeable jitter at low
frequencies. Therefore it is recommended for lower sample
rates to divide down a higher frequency clock to the desired
sample rate. The ratio of clock frequency to conversion
rate is shown in Table 1. If the clock input is to be driven
with logic, it is recommended that the 49.9Ω termination
resistor (R4) be removed. Driving R4 with discrete logic
may result in slow rising edges. These slow rising edges
may compromise the SNR of the converter in the presence
of high-amplitude higher frequency input signals.
Data Output
Parallel data output from this board (0V to 2.5V default),
if not connected to the DC890, can be acquired by a logic
analyzer, and subsequently imported into a spreadsheet, or
mathematical package depending on what form of digital
signal processing is desired. Alternatively, the data can
be fed directly into an application circuit. Use pin 50 of
P1 to latch the data. The data should be latched using the
negative edge of this signal. The data output signal levels
at P1 can also be increased to 0V to 3.3V if the application
circuit requires a higher voltage. This is accomplished by
moving JP2 to the 3.3V position.
Reference
The default reference is the LTC2358-18 internal 4.096V
reference. Alternatively, if a higher reference voltage is de-
sired, the LTC6655-5 reference (U7) can be used by setting
the REF jumper (JP1) to the EXT position and installing a
0Ω resistor in the R7 position as shown in Figure4. This
should result in better SNR performance but may slightly
degrade the THD performance of the LTC2358-18.
V+
5V
C13
1µF
C12
2.2µF
C15
1µF 50V
C11
47µF 10V
1210
X7R
REFINREFBUF
1921
R7
0Ω
REFBUF
REFBUF
E1
DC2365 F04
SHDN
VIN
GND
GND
GND
VOUT_F
VOUT_S
GND
8
7
6
5
1
2
3
4
U7
LTC6655BHMS8-5
1
2
3
INT
EXT
JP1
REF
Figure4. External Reference Option for DC2365A
Analog Inputs
All eight inputs have the same driver circuitry. An example
of the default driver circuit for the analog inputs of the
LTC2358-18 on the DC2365A is shown in Figure5. The
circuit of Figure5 provides a pseudo-differential output to
channel 0 of the LTC2358-18 with a maximum ±10.24V
input voltage. Alternatively, the jumpers for AIN0 at JP5
and J7 can be removed and AIN0 can be driven fully dif-
ferentially externally through a twisted pair cable at the
provided terminals at JP5. Fully differential drive should
provide a slight improvement in THD performance.
DC890 Data Collection
For SINAD, THD or SNR testing, a low noise, low distor-
tion generator such as the B&K Type 1051 or Stanford
Research SR1 should be used. A low jitter RF oscillator
such as the Rohde & Schwarz SMB100A is used to drive
the clock input. This demo board is tested in house by
attempting to duplicate the FFT plot shown in Typical