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| 型號(hào)： | EVAL-AD7949EDZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 32/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL AD7949 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | PulSAR® |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 250k |
| 數(shù)據(jù)接口： | 串行 |
| 輸入范圍： | ±VREF |
| 在以下條件下的電源（標(biāo)準(zhǔn)）： | 10.8mW @ 250kSPS，5V |
| 工作溫度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7949 |
| 已供物品： | 板 |
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Data Sheet
AD7949
Rev. D | Page 9 of 32
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
PIN 1
INDICATOR
1
VDD
2
REF
3
REFIN
4
GND
5
GND
13 SCK
14 SDO
15 VIO
12 DIN
11 CNV
6
IN4
7
IN5
8
IN6
0
1
CO
M
9
IN7
8
1
IN2
9
1
IN3
0
2
V
DD
7
1
IN1
6
1
IN0
TOP VIEW
(Not to Scale)
AD7949
NOTES
1. THE EXPOSED PAD IS NOT CONNECTED
INTERNALLY. FOR INCREASED
RELIABILITY OF THE SOLDER JOINTS, IT
IS RECOMMENDED THAT THE PAD BE
SOLDERED TO THE SYSTEM
GROUND PLANE.
07351-
004
Figure 4. Pin Configuration
Table 6. Pin Function Descriptions
Pin No.
Mnemonic
Type1
Description
1, 20
VDD
P
Power Supply. Nominally 2.5 V to 5.5 V when using an external reference and decoupled with
10 μF and 100 nF capacitors.
When using the internal reference for 2.5 V output, the minimum should be 3.0 V.
When using the internal reference for 4.096 V output, the minimum should be 4.5 V.
2
REF
AI/O
Reference Input/Output. See the Voltage Reference Output/Input section.
When the internal reference is enabled, this pin produces a selectable system reference = 2.5 V or
4.096 V.
When the internal reference is disabled and the buffer is enabled, REF produces a buffered
version of the voltage present on the REFIN pin (4.096 V maximum), useful when using low cost,
low power references.
For improved drift performance, connect a precision reference to REF (0.5 V to VDD).
For any reference method, this pin needs decoupling with an external 10 μF capacitor
connected as close to REF as possible. See the Reference Decoupling section.
3
REFIN
AI/O
Internal Reference Output/Reference Buffer Input. See the Voltage Reference Output/Input
section.
When using the internal reference, the internal unbuffered reference voltage is present and
needs decoupling with a 0.1 μF capacitor.
When using the internal reference buffer, apply a source between 0.5 V and 4.096 V that is
buffered to the REF pin as described above.
4, 5
GND
P
Power Supply Ground.
6 to 9
IN4 to IN7
AI
Channel 4 through Channel 7 Analog Inputs.
10
COM
AI
Common Channel Input. All input channels, IN[7:0], can be referenced to a common-mode
point of 0 V or VREF/2 V.
11
CNV
DI
Convert Input. On the rising edge, CNV initiates the conversion. During conversion, if CNV is
held high, the busy indictor is enabled.
12
DIN
DI
Data Input. This input is used for writing to the 14-bit configuration register. The configuration
register can be written to during and after conversion.
13
SCK
DI
Serial Data Clock Input. This input is used to clock out the data on SDO and clock in data on DIN
in an MSB first fashion.
14
SDO
DO
Serial Data Output. The conversion result is output on this pin, synchronized to SCK. In unipolar
modes, conversion results are straight binary; in bipolar modes, conversion results are twos
complement.
15
VIO
P
Input/Output Interface Digital Power. Nominally at the same supply as the host interface (1.8 V,
2.5 V, 3 V, or 5 V).
16 to 19
IN0 to IN3
AI
Channel 0 through Channel 3 Analog Inputs.
21
(EPAD)
Exposed Pad
(EPAD)
NC
The exposed pad is not connected internally. For increased reliability of the solder joints, it is
recommended that the pad be soldered to the system ground plane.
1
AI = analog input, AI/O = analog input/output, DI = digital input, DO = digital output, and P = power.
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