AD7367 Analog Devices, AD7367 Datasheet - Page 9

• Manufacturer Part Number: AD7367
• Description: True Bipolar Input, Dual 14-Bit, 2-Channel, Simultaneous Sampling SAR ADC
• Manufacturer: Analog Devices

Specifications of AD7367

• Resolution (bits): 14bit
• # Chan: 4
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni,SE-Bip,SE-Uni
• Ain Range: Bip (Vref) x 2,Bip (Vref) x 4,Bip 10V,Bip 5.0V,Uni (Vref) x 4,Uni 10V
• Adc Architecture: SAR
• Pkg Type: SOP

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 6. Pin Function Descriptions
Pin No.
1, 23
2
3
4, 5
6
7, 17
8
9, 16
10
11, 12
13, 14
15
Mnemonic
D
V
DV
RANGE1,
RANGE0
ADDR
AGND
AV
D
V
V
V
V
DRIVE
SS
A1
B2
DD
OUT
CAP
CC
CC
, V
, V
A, D
A, D
A2
B1
CAP
OUT
B
B
Description
Serial Data Outputs. The data output is supplied to each pin as a serial data stream. The bits are clocked out on
the falling edge of the SCLK input; 12 SCLK cycles are required to access a result from the AD7366, and 14 SCLK
cycles are required for the AD7367. The data simultaneously appears on both pins from the simultaneous con-
versions of both ADCs. The data stream consists of the 12 bits of conversion data for the AD7366 and 14 bits for
the AD7367 and is provided MSB first. If CS is held low for a further 14 SCLK cycles, on either D
data from the other ADC follows on that D
by two zeros. Therfore data from a simultaneous conversion on both ADCs can be gathered in serial format on
either D
Logic Power Supply Input. The voltage supplied at this pin determines at what voltage the interface operates.
This pin should be decoupled to DGND. The voltage range on this pin is 2.7 V to 5.25 V and may be different
from the voltage at AV
rate of 1.12 MSPS for the AD7366 or 1 MSPS for the AD7367, V
Digital Supply Voltage, 4.75 V to 5.25 V. The DV
For best performance, it is recommended that the DV
voltage difference between them never exceeds 0.3 V even on a transient basis. This supply should be decoupled
to DGND. Place 10 µF and 100 nF decoupling capacitors on the DV
Analog Input Range Selection, Logic Inputs. The polarity on these pins determines the input range of the analog
input channels. See the Analog Inputs section and Table 8 for details.
Multiplexer Select, Logic Input. This input is used to select the pair of channels to be simultaneously converted,
either Channel 1 of both ADC A and ADC B, or Channel 2 of both ADC A and ADC B. The logic state on this pin is
latched on the rising edge of BUSY to set up the multiplexer for the next conversion.
Analog Ground. Ground reference point for all analog circuitry on the AD7366/AD7367. All analog input signals
and any external reference signal should be referred to this AGND voltage. Both AGND pins should connect to
the AGND plane of a system. The AGND and DGND voltages should ideally be at the same potential and must
not be more than 0.3 V apart, even on a transient basis.
Analog Supply Voltage, 4.75 V to 5.25 V. This is the supply voltage for the ADC cores. The AV
should ideally be at the same potential. For best performance, it is recommended that the DV
shorted together, to ensure that the voltage difference between them never exceeds 0.3 V even on a transient
basis. This supply should be decoupled to AGND. Place 10 µF and 100 nF decoupling capacitors on the AV
Decoupling Capacitor Pins. Decoupling capacitors are connected to these pins to decouple the reference buffer
for each respective ADC. For best performance, it is recommended that a 680 nF decoupling capacitor be used
on these pins. Provided the output is buffered, the on-chip reference can be taken from these pins and applied
externally to the rest of a system.
Negative Power Supply Voltage. This is the negative supply voltage for the high voltage analog input structure
of the AD7366/AD7367. The supply must be less than a maximum voltage of −11.5 V for all analog input ranges.
See Table 7 for more details. Place 10 µF and 100 nF decoupling capacitors on the V
Analog Inputs of ADC A. Both analog inputs are single-ended. The analog input range on these channels is
determined by the RANGE0 and RANGE1 pins.
Analog Inputs of ADC B. Both analog inputs are single-ended. The analog input range on these channels is
determined by the RANGE0 and RANGE1 pins.
Positive Power Supply Voltage. This is the positive supply voltage for the high voltage analog input structure of
the AD7366/AD7367. The supply must be greater than a minimum voltage of 11.5 V for all analog input ranges.
See Table 7 for more details. Place 10 µF and 100 nF decoupling capacitors on the V
OUT
A or D
OUT
B using only one serial port. See the Serial Interface section for more information.
CC
and DV
RANGE1
RANGE0
D
V
D
AGND
ADDR
DRIVE
DV
OUT
AV
CAP
V
V
V
CC
CC
SS
A1
A2
Figure 2. Pin Configuration
A
A
CC
10
11
12
1
2
3
4
5
6
7
8
9
, but should never exceed either by more than 0.3 V. To achieve a throughput
Rev. D | Page 9 of 28
(Not to Scale)
AD7366/
AD7367
TOP VIEW
OUT
pin. Note, the second serial result from the AD7366 is preceeded
CC
24
23
22
21
20
19
18
17
16
15
14
13
and AV
DGND
D
BUSY
CNVST
SCLK
CS
REFSEL
AGND
D
V
V
V
DD
B1
B2
OUT
CAP
CC
B
B
CC
and AV
voltages should ideally be at the same potential.
DRIVE
CC
pins be shorted together, to ensure that the
must be ≥ 4.75 V.
CC
pin.
SS
DD
pin.
pin.
AD7366/AD7367
CC
and DV
CC
OUT
and AV
A or D
CC
OUT
voltages
CC
pins be
B, the
CC
pin.