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| 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(yè)數(shù)： | 29/32頁(yè) |
| 文件大?。?/td> | 587K |
| 代理商： | AD7643 |
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AD7612
HARDWARE CONFIGURATION
The AD7612 can be configured at any time with the dedicated
hardware pins WARP, IMPULSE, BIPOLAR, TEN, OB/2C, and
PD for parallel mode (SER/PAR = low) or serial hardware mode
(SER/ PAR = high, HW/SW = high). Programming the AD7612
for mode selection and input range configuration can be done
before or during conversion. Like the RESET input, the ADC
requires at least one acquisition time to settle as indicated in
Figure 44. See Table 6 for pin descriptions. Note that these inputs
are high impedance when using the software configuration mode.
Rev. 0 | Page 29 of 32
SOFTWARE CONFIGURATION
The pins multiplexed on D[15:12] used for software configura-
tion are: HW/SW, SCIN, SCCLK, and SCCS. The AD7612 is
programmed using the dedicated write-only serial configurable
port (SCP) for conversion mode, input range selection, output
coding, and power-down using the serial configuration register.
See Table 9 for details of each bit in the configuration register.
The SCP can only be used in serial software mode selected with
SER/PAR = high and HW/SW = low since the port is multiplexed
on the parallel interface.
The SCP is accessed by asserting the port’s chip select, SCCS,
and then writing SCIN synchronized with SCCLK, which (like
SDCLK) is edge sensitive depending on the state of INVSCLK.
See Figure 45 for timing details. SCIN is clocked into the con-
figuration register MSB first. The configuration register is an
internal shift register that begins with Bit 8, the start bit. The 9
th
SPPCLK edge updates the register and allows the new settings to be
used. As indicated in the timing diagram, at least one acquisition
time is required from the 9
th
SCCLK edge. Bits [1:0] are reserved
bits and are not written to while the SCP is being updated.
The SCP can be written to at any time, up to 40 MHz, and it is
recommended to write to while the AD7612 is not busy convert-
ing, as detailed in Figure 45. In this mode, the full 750 kSPS is not
attainable because the time required for SCP access is (t
31
+ 8 × 1/
SCCLK +t
8
) minimum. If the full throughput is required, the
SCP can be written to during conversion, however it is not
recommended to write to the SCP during the last 475 ns of con-
version (BUSY = high) or performance degradation can result.
In addition, the SCP can be accessed in both serial master and
serial slave read during and read after convert modes.
Note that at power up, the configuration register is undefined.
The RESET input clears the configuration register (sets all bits
to 0), thus placing the configuration to 0 V to 5 V input, normal
mode, and twos complemented output.
Table 9. Configuration Register Description
Bit
Name
Description
8
START
START bit. With the SCP enabled (SCCS = low),
when START is high, the first rising edge of SCCLK
(INVSCLK = low) begins to load the register with
the new configuration.
7
BIPOLAR
Input Range Select. Used in conjunction with
Bit 6, TEN, per the following:
Input Range
0 V to 5 V
0 V to 10 V
±5 V
±10 V
6
TEN
Input Range Select. See Bit 7, BIPOLAR.
5
PD
Power Down.
PD = Low, normal operation.
PD = High, power down the ADC. The SCP is accessi-
ble while in power down. To power up the ADC,
write PD = low on the next configuration setting.
4
IMPULSE
Mode Select. Used in conjunction with Bit 3,
WARP per the following:
Mode
Normal
Impulse
Warp
Normal
3
WARP
Mode Select. See Bit 4, IMPULSE.
2
OB/2C
Output Coding
OB/2C = Low, use twos complement output.
OB/2C = High, use straight binary output.
1
RSV
Reserved.
0
RSV
Reserved.
BIPOLAR
Low
Low
High
Low
TEN
Low
High
Low
High
WARP
Low
Low
High
High
IMPULSE
Low
High
Low
High
WARP,
IMPULSE
BUSY
HW/SW = 0
CNVST
BIPOLAR,
TEN
t
8
SER/PAR = 0, 1
PD = 0
t
8
0
Figure 44. Hardware Configuration Timing
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