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AD7934-6 Datasheet

  • AD7934-6

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

  • 30頁(yè)

  • AD

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AD7934-6
CONTROL REGISTER
The control register on the AD7934-6 is a 12-bit, write-only register. Data is written to this register using the CS and WR pins. The
control register is shown in Table 6 and the functions of the bits are described in Table 7. At power-up, the default bit settings in the
control register are all 0s.
Table 6. Control Register Bits
MSB
DB11
PM1
DB10
PM0
DB9
CODING
DB8
REF
DB7
ZERO
DB6
ADD1
DB5
ADD0
DB4
MODE1
DB3
MODE0
DB2
SEQ1
DB1
SEQ0
LSB
DB0
RANGE
Table 7. Control Register Bit Function Description
Bit No.
11, 10
9
8
Mnemonic
PM1, PM0
CODING
REF
Description
Power management bits used to select the power mode of operation. The user can choose between normal mode
and various power-down modes of operation as shown in Table 8.
Selects the output coding of the conversion result. If set to 0, the output coding is straight (natural) binary. If set to
1, the output coding is twos complement.
Selects whether the internal or 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. If this bit is Logic 1, the internal reference is selected. See the
Reference Section.
Not used. This bit should always be set to Logic 0.
Two address bits that either select which analog input channel is to be converted in the next conversion, if the
sequencer is not used, or select the final channel in a consecutive sequence when the sequencer is used as
described in Table 10. The selected input channel is decoded as shown in Table 9.
Two mode pins that select the type of analog input on the four V
IN
pins. The AD7934-6 has four single-ended
inputs, two fully differential inputs, or two pseudo differential inputs. See Table 9.
Used in conjunction with the SEQ0 bit to control the sequencer function. See Table 10.
Used in conjunction with the SEQ1 bit to control the sequencer function. See Table 10.
Selects the analog input range of the AD7934-6. If 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 脳 V
REF
. When this range is selected, AV
DD
must be 4.75 V to
5.25 V if a 2.5 V reference is used; otherwise, care must be taken to ensure that the analog input remains within
the supply rails. See the Analog Input Configurations section for more information.
7
6, 5
ZERO
ADD1,
ADD0
MODE1,
MODE0
SEQ1
SEQ0
RANGE
4, 3
2
1
0
Table 8. Power Mode Selection Using the Power Management Bits in the Control Register
PM1
0
0
1
PM0
0
1
0
Mode
Normal Mode
Autoshutdown
Autostandby
Description
When operating in normal mode, all circuitry is fully powered up at all times.
When operating in autoshutdown mode, the AD7934-6 enters full shutdown mode at the end of each
conversion. In this mode, all circuitry is powered down.
When the AD7934-6 enters this mode, the reference remains fully powered, the reference buffer is partially
powered down, and all other circuitry is fully powered down. This mode is similar to autoshutdown mode,
but it allows the part to power-up in 7 碌s (or 600 ns if an external reference is used). See the Power Modes
of Operation section for more information.
When the AD7934-6 enters this mode, all circuitry is powered down. The information in the control register
is retained.
1
1
Full Shutdown
Table 9. Analog Input Type Selection
MODE0 = 0, MODE1 = 0
Four Single-Ended I/P
Channels
V
IN+
V
IN鈭?/div>
VIN0
AGND
VIN1
AGND
VIN2
AGND
VIN3
AGND
MODE0 = 0, MODE1 = 1
Two Fully Differential
I/P Channels
V
IN+
V
IN鈭?/div>
VIN0
VIN1
VIN1
VIN0
VIN2
VIN3
VIN3
VIN2
MODE0 = 1, MODE1 = 0
Two Pseudo Differential
I/P Channels
V
IN+
V
IN鈭?/div>
VIN0
VIN1
VIN1
VIN0
VIN2
VIN3
VIN3
VIN2
MODE0 = 1, MODE1 = 1
Not Used
Channel Address
ADD1
ADD0
0
0
0
1
1
0
1
1
Rev. A | Page 13 of 28

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