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AD7934-6 Datasheet

  • AD7934-6

  • 4-Channel, 625 kSPS, 12-Bit Parallel ADC with a Sequencer

  • 30頁

  • AD

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AD7934-6
鈥?0
F
IN
= 50kHz
鈥?5
鈥?0
鈥?5
V
DD
= 3V
ANALOG INPUT CONFIGURATIONS
The AD7934-6 has software selectable analog input
configurations. The user can choose either four single-
ended inputs, two fully differential pairs, or two pseudo
differential pairs. The analog input configuration is chosen
by setting the MODE0/MODE1 bits in the internal control
register (see Table 9).
THD (dB)
鈥?0
鈥?5
鈥?0
鈥?5
鈥?0
鈥?5
鈥?0
10
100
R
SOURCE
(
鈩?/div>
)
V
DD
= 5V
04752-018
Single-Ended Mode
The AD7934-6 can have four single-ended analog input
channels by setting the MODE0 and MODE1 bits in the control
register to 0. In applications where the signal source has a high
impedance, it is recommended to buffer the analog input before
applying it to the ADC. An op amp suitable for this function is
the AD8021. The analog input range of the AD7934-6 can be
programmed to be either 0 to V
REF
or 0 to 2 脳 V
REF
.
If the analog input signal to be sampled is bipolar, the internal
reference of the ADC can be used to externally bias up this
signal to make it the correct format for the ADC.
Figure 23 shows a typical connection diagram when operating
the ADC in single-ended mode. This diagram shows a bipolar
signal of amplitude 鹵1.25 V being preconditioned before it is
applied to the AD7934-6. In cases where the analog input
amplitude is 鹵2.5 V, the 3R resistor can be replaced with a
resistor of value R. The resultant voltage on the analog input of
the AD7934-6 is a signal ranging from 0 V to 5 V. In this case,
the 2 脳 V
REF
mode can be used.
R
+1.25V
0V
鈥?.25V
R
V
IN
3R
R
V
IN7
+2.5V
0V
V
IN0
1k
Figure 20. THD vs. Source Impedance in Single-Ended Mode
鈥?0
F
IN
= 50kHz
鈥?5
鈥?0
鈥?5
THD (dB)
鈥?0
鈥?5
V
DD
= 3V
鈥?0
04752-019
鈥?5
鈥?00
10
V
DD
= 5V
100
R
SOURCE
(
鈩?/div>
)
1k
Figure 21. THD vs. Source Impedance in Differential Mode
Figure 22 shows a graph of the THD vs. the analog input
frequency for various supplies, while sampling at 625 kHz with
an SCLK of 10 MHz. In this case, the source impedance is 10 鈩?
鈥?0
V
DD
= 3V
SINGLE-ENDED MODE
AD7934-6
1
V
REFOUT
鈥?0
鈥?0
THD (dB)
0.47碌F
04752-031
V
DD
= 5V
SINGLE-ENDED MODE
1
ADDITIONAL
鈥?0
V
DD
= 5V/3V
DIFFERENTIAL MODE
PINS OMITTED FOR CLARITY.
Figure 23. Single-Ended Mode Connection Diagram
鈥?0
鈥?00
Differential Mode
The AD7934-6 can have two differential analog input pairs by
setting the MODE0 and MODE1 bits in the control register to
0 and 1, respectively.
Differential signals have some benefits over single-ended
signals, including noise immunity based on the device鈥檚
common-mode rejection, and improvements in distortion
performance. Figure 24 defines the fully differential analog
input of the AD7934-6.
鈥?20
0
F
SAMPLE
= 625kSPS
RANGE = 0 TO V
REF
100
200
300
400
500
INPUT FREQUENCY (kHz)
600
700
Figure 22. THD vs. Analog Input Frequency for Various Supply Voltages
04752-020
鈥?10
Rev. A | Page 17 of 28

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