參數(shù)資料
型號(hào)： AD7934
廠商： ANALOG DEVICES INC
元件分類： ADC
英文描述： 4-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer
中文描述： 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO28
封裝： TSSOP-28
文件頁(yè)數(shù)： 16/32頁(yè)
文件大?。?/td> 1253K
代理商： AD7934
AD7933/AD7934
Preliminary Technical Data
CONTROL REGISTER
The control register on the AD7933/AD7934 is a 12-bit, write-only register. Data is written to this register using the CS and WR pins. The
control register is shown below and the functions of the bits are described in
register are all 0s.
Table 6. Control Register Bits
MSB
D11
D10
D9
D8
D7
D6
PM1
PM0
CODING
REF
ZERO
ADD1
. At power-up, the default bit settings in the control
Table 7
Table 7. Control Register Bit Function Description
Bit No.
Mnemonic Description
Power Management Bits. These two bits are used to select the power mode of operation. The user can choose
between either normal mode or various power-down modes of operation as shown in
This bit selects the output coding of the conversion result. If this bit is set to 0, the output coding is straight
(natural) binary. If this bit is set to 1, the output coding is twos complement.
This bit selects whether the internal or an external reference is used to perform the conversion. If this bit is Logic 0,
an external reference should be applied to the V
REF
pin, and if it is Logic 1, the internal reference is selected (see
the Reference Section).
7
ZERO
This bit is not used so it should always be set to Logic 0.
These two address bits are used to either select which analog input channel is to be converted in the next
conversion, if the sequencer is not being used, or to select the final channel in a consecutive sequence when the
sequencer is being used as described in
MODE1,
MODE0
single-ended inputs, two fully differential inputs, or two pseudo-differential inputs (see
The SEQ1 bit in the control register is used in conjunction with the SEQ0 bit to control the sequencer function (see
).
The SEQ0 bit in the control register is used in conjunction with the SEQ1 bit to control the sequencer function (see
).
This bit selects the analog input range of the AD7933/AD7934. If it is set to 0, the analog input range extends from
0 V to V
REF
. If it is set to 1, the analog input range extends from 0 V to 2 × V
REF
. When this range is selected, AV
DD
must be 4.75 V to 5.25 V.
D5
ADD0
D4
MODE1
D3
MODE0
D2
SEQ1
D1
SEQ0
LSB
D0
RANGE
11, 10
PM1, PM0
.
9
CODING
8
REF
6, 5
ADD1,
ADD0
. The selected input channel is decoded as shown in
.
4, 3
The two mode pins select the type of analog input on the four V
IN
pins. The AD7933/AD7934 have either four
).
2
SEQ1
1
SEQ0
0
RANGE
Table 8
Table 8. Power Mode Selection using the Power Management Bits in the Control Register
PM1
PM0
Mode
Description
0
0
Normal
Mode
0
1
Auto
Shutdown
each conversion. In this mode, all circuitry is powered down.
1
0
Auto
Standby
the auto shutdown mode but it allows the part to power up in 1 μs.
1
1
Full
Shutdown
register is retained.
Table 10
Table 10
Table 10
Table 9
Table 9
When operating in normal mode, all circuitry is fully powered up at all times.
When operating in auto shutdown mode, the AD7933/AD7934 will enter full shutdown mode at the end of
When the AD7933/AD7934 enter this mode, all circuitry is partially powered down. This mode is similar to
When the AD7933/AD7934 enters this mode, all circuitry is powered down. The information in the control
Rev. PrG | Page 16 of 32
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