V
參數(shù)資料
型號: EVAL-AD7764EDZ
廠商: Analog Devices Inc
文件頁數(shù): 11/33頁
文件大小: 0K
描述: BOARD EVAL AD7764
標(biāo)準(zhǔn)包裝: 1
ADC 的數(shù)量: 1
位數(shù): 24
采樣率(每秒): 312k
數(shù)據(jù)接口: 串行
輸入范圍: ±3.2768 V
在以下條件下的電源(標(biāo)準(zhǔn)): 300mW @ 312kSPS
工作溫度: -40°C ~ 85°C
已用 IC / 零件: AD7764
已供物品: 板,CD
AD7764
Rev. A | Page 18 of 32
AD7764 INPUT STRUCTURE
The AD7764 requires a 4.096 V input to the reference pin,
VREF+, supplied by a high precision reference, such as the
ADR444. Because the input to the device’s Σ-Δ modulator is
fully differential, the effective differential reference range is
8.192 V.
V
192
.
8
096
.
4
2
)
(
=
×
=
+ Diff
REF
V
As is inherent in Σ-Δ modulators, only a certain portion of this
full reference may be used. With the AD7764, 80% of the full
differential reference can be applied to the modulator’s differ-
ential inputs.
V
5536
.
6
8
.
0
V
192
.
8
_
=
×
=
FULLSCALE
Input
Modulator
This means that a maximum of ±3.2768 V p-p full-scale can be
applied to each of the AD7764 modulator inputs (Pin 5 and
Pin 6), with the AD7764 being specified with an input 0.5 dB
down from full scale (0.5 dBFS). The AD7764 modulator
inputs must have a common-mode input of 2.048 V.
Figure 34 shows the relative scaling between the differential
voltages applied to the modulator pins and the respective 24-bit
twos complement digital outputs.
06518-
120
INPUT TO MODULATOR
PIN 5 AND PIN 6
VIN– AND VIN+
VIN+ = 3.6855V
0111 1111 1111 1111 1111 1111
0000 0000 0000 0000 0000 0000
+3.2768V = MODULATOR FULL-SCALE = 80% OF 4.096V
80% OF 4.096V = MODULATOR FULL-SCALE = –3.2768V
+4.096V
–4.096V
VIN– = 0.4105V
VIN+ = 2.048V
VIN– = 2.048V
VIN– = 3.6855V
VIN+ = 0.4105V
1000 0000 0000 0000 0000 0000
0111 1000 1101 0110 1111 1101
1000 0111 0010 1001 0000 0010
–0.5dBFS INPUT
OVERRANGE REGION
DIGITAL OUTPUT
ON SDO PIN
0000 0000 0000 0000 0000 0001
1111 1111 1111 1111 1111 1111
TWOS COMPLEMENT
DIGITAL OUTPUT
INPUT VOLTAGE (V)
Figure 34. AD7764 Scaling: Modulator Input Voltage vs. Digital Output Code
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