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參數資料
| 型號： | AD7920BKS-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 250 kSPS, 10-/12-Bit ADCs in 6-Lead SC70 |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO6 |
| 封裝： | MO-203AB, SC-70, 6 PIN |
| 文件頁數： | 10/20頁 |
| 文件大小： | 1091K |
| 代理商： | AD7920BKS-REEL7 |
REV. B
–10–
AD7910/AD7920
CIRCUIT INFORMATION
The AD7910/AD7920 are fast, micropower, 10-bit/12-bit,
single-supply A/D converters, respectively. The parts can be
operated from a 2.35 V to 5.25 V supply. When operated from
either a 5 V supply or a 3 V supply, the AD7910/AD7920 are
capable of throughput rates of 250 kSPS when provided with a
5 MHz clock.
The AD7910/AD7920 provide the user with an on-chip track-
and-hold, A/D converter, and a serial interface housed in a tiny
6-lead SC70 package or 8-lead MSOP package, which offers the
user considerable space saving advantages over alternative solu-
tions. The serial clock input accesses data from the part but also
provides the clock source for the successive-approximation A/D
converter. The analog input range is 0 V to V
DD
. An external
reference is not required for the ADC and there is no reference
on-chip. The reference for the AD7910/AD7920 is derived from
the power supply and thus gives the widest dynamic input range.
The AD7910/AD7920 also feature a power-down option to
allow power saving between conversions. The power-down feature
is implemented across the standard serial interface, as described
in the Modes of Operation section.
CONVERTER OPERATION
The AD7910/AD7920 is a successive-approximation analog-
to-digital converter based around a charge redistribution DAC.
Figures 4 and 5 show simplified schematics of the ADC.
Figure 4 shows the ADC during its acquisition phase. When
SW2 is closed and SW1 is in position A, the comparator is
held in a balanced condition, and the sampling capacitor
acquires the signal on V
IN
.
CHARGE
REDISTRIBUTION
DAC
CONTROL
LOGIC
COMPARATOR
SW2
SAMPLING
CAPACITOR
ACQUISITION
PHASE
SW1
A
B
AGND
V
DD
/2
V
IN
Figure 4. ADC Acquisition Phase
CODE
1.0
0.4
–0.2
0
1024
D
512
0.8
0.6
0.2
0
–0.4
–0.6
–0.8
–1.0
1536
2048
2560
3072
3584
4096
V
= 2.35V
TEMP = 25 C
f
SAMPLE
= 250kSPS
TPC 5. AD7920 DNL Performance
INPUT FREQUENCY (kHz)
–30
–60
10
1000
T
100
–10
–20
–40
–50
–70
–80
–90
V
DD
= 3.6V
R
IN
= 10k
R
IN
= 1k
R
IN
= 130
R
IN
= 13
R
IN
= 0
TPC 6. THD vs. Analog Input Frequency for
Various Source Impedances
INPUT FREQUENCY (kHz)
–75
–90
10
1000
T
100
–65
–70
–80
–85
V
DD
= 5.25V
V
DD
= 2.35V
V
DD
= 2.7V
V
DD
= 4.75V
V
DD
= 3.6V
TPC 7. THD vs. Analog Input Frequency for
Various Supply Voltages
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