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參數(shù)資料
| 型號(hào)： | AD7643 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 16-Bit, 750 kSPS, Unipolar/Bipolar Programmable Input PulSAR ADC |
| 中文描述： | 16位，750 kSPS的，單極/雙極可編程輸入PulSAR系列ADC的 |
| 文件頁數(shù)： | 18/32頁 |
| 文件大?。?/td> | 587K |
| 代理商： | AD7643 |
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AD7612
MODES OF OPERATION
The AD7612 features three modes of operation: warp, normal,
and impulse. Each of these modes is more suitable to specific
applications. The mode is configured with the input pins, WARP
and IMPULSE, or via the configuration register. See Table 6 for
the pin details and the Hardware Configuration section and
Software Configuration section for programming the mode
selection with either pins or configuration register. Note that
when using the configuration register, the WARP and IMPULSE
inputs are don’t cares and should be tied to either high or low.
Rev. 0 | Page 18 of 32
Warp Mode
Setting WARP = high and IMPULSE = low allow the fastest con-
version rate up to 750 kSPS. However, in this mode, the full
specified accuracy is guaranteed only when the time between
conversions does not exceed 1 ms. If the time between two
consecutive conversions is longer than 1 ms (after power-up),
the first conversion result should be ignored since in warp mode,
the ADC performs a background calibration during the SAR
conversion process. This calibration can drift if the time between
conversions exceeds 1 ms thus causing the first conversion to
appear offset. This mode makes the AD7612 ideal for applications
where both high accuracy and fast sample rate are required. In
addition, the AD7612 can run up to 900 kSPS throughput with
some performance degradation, mainly dc linearity.
Normal Mode
Setting WARP = IMPULSE = low or WARP = IMPULSE = high
allows the fastest mode (600 kSPS) without any limitation on
time between conversions. This mode makes the AD7612 ideal
for asynchronous applications such as data acquisition systems,
where both high accuracy and fast sample rate are required.
Impulse Mode
Setting WARP = low and IMPULSE = high uses the lowest power
dissipation mode and allows power saving between conversions.
The maximum throughput in this mode is 500 kSPS and in this
mode, the ADC powers down circuits after conversion making
the AD7612 ideal for battery-powered applications.
TRANSFER FUNCTIONS
Using the OB/2C digital input or via the configuration register,
the AD7612 offers two output codings: straight binary and twos
complement. See Figure 26 and Table 7 for the ideal transfer char-
acteristic and digital output codes for the different analog input
ranges, V
IN
. Note that when using the configuration register, the
OB/2C input is a don’t care and should be tied to either high or low.
000...000
000...001
000...010
111...101
111...110
111...111
A
ANALOG INPUT
+FSR – 1.5 LSB
+FSR – 1 LSB
–FSR + 1 LSB
–FSR
–FSR + 0.5 LSB
0
Figure 26. ADC Ideal Transfer Function
Table 7. Output Codes and Ideal Input Voltages
Description
V
IN
= 5 V
FSR 1 LSB
4.999924 V
FSR 2 LSB
4.999847 V
Midscale + 1 LSB
2.500076 V
Midscale
2.5 V
Midscale 1 LSB
2.499924 V
FSR + 1 LSB
76.3 μV
FSR
0 V
1
This is also the code for overrange analog input (V
IN+
V
IN
above V
REF
V
REFGND
).
2
This is also the code for overrange analog input (V
IN+
V
IN
below V
REF
V
REFGND
).
V
REF
= 5 V
Digital Output Code
Twos Complement
0x7FFF
1
0x7FFE
0x0001
0x0000
0xFFFF
0x8001
0x8000
2
V
IN
= 10 V
9.999847 V
9.999695 V
5.000153 V
5.000000 V
4.999847 V
152.6 μV
0 V
V
IN
= ±5 V
+4.999847 V
+4.999695 V
+152.6 μV
0 V
152.6 μV
4.999847 V
5 V
V
IN
= ±10 V
+9.999695 V
+9.999390 V
+305.2 μV
0 V
305.2 μV
9.999695 V
10 V
Straight Binary
0xFFFF
1
0xFFFE
0x8001
0x8000
0x7FFF
0x0001
0x0000
2
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