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參數(shù)資料
| 型號： | AD7625BCPZRL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 6/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 16BIT 6MSPS SAR 32LFCSP |
| 設(shè)計資源： | High Speed, Precision, Differential AC-Coupled Drive Circuit for AD7625 (CN0080) |
| 標(biāo)準(zhǔn)包裝： | 1,500 |
| 系列： | PulSAR® |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 6M |
| 數(shù)據(jù)接口： | 串行 |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 190mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 32-LFCSP-VQ（5x5） |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個差分，雙極 |
AD7625
Data Sheet
Rev. A | Page 14 of 24
TRANSFER FUNCTIONS
The AD7625 uses a 4.096 V reference. The AD7625 converts
the differential voltage of the antiphase analog inputs (IN+ and
IN) into a digital output. The analog inputs, IN+ and IN,
require a 2.048 V common-mode voltage (REF/2).
The 16-bit conversion result is in MSB first, twos complement
format.
The ideal transfer functions for the AD7625 are shown in
07652-
031
100 ... 000
100 ... 001
100 ... 010
011 ... 101
011 ... 110
011 ... 111
A
D
C
O
D
E
(T
W
O
S
C
O
MPL
EMEN
T
)
ANALOG INPUT
+FSR – 1.5LSB
+FSR – 1LSB
–FSR + 1LSB
–FSR
–FSR + 0.5LSB
Figure 19. ADC Ideal Transfer Functions (FSR = Full-Scale Range)
Table 7. Output Codes and Ideal Input Voltages
Description
Analog Input
(IN+ IN)
REF = 4.096 V
Digital Output Code
Twos Complement (Hex)
FSR 1 LSB
+4.0959375 V
0x1FFF
Midscale + 1 LSB
+62.5 μV
0x0001
Midscale
0 V
0x0000
Midscale 1 LSB
62.5 μV
0xFFFF
FSR + 1 LSB
4.0959375 V
0x1001
FSR
4.096 V
0x1000
ANALOG INPUTS
The analog inputs, IN+ and IN, applied to the AD7625 must be
180° out of phase with each other. Figure 20 shows an equivalent
circuit of the input structure of the AD7625.
The two diodes provide ESD protection for the analog inputs,
IN+ and IN. Care must be taken to ensure that the analog input
signal does not exceed the reference voltage by more than 0.3 V.
If the analog input signal exceeds this level, the diodes become
forward-biased and start conducting current. These diodes can
handle a forward-biased current of 130 mA maximum. However,
if the supplies of the input buffer (for example, the supplies of
the ADA4899-1 in Figure 24) are different from those of the
reference, the analog input signal may eventually exceed the
supply rails by more than 0.3 V. In such a case (for example, an
input buffer with a short circuit), the current limitation can be
used to protect the part.
07652-
032
IN+
OR
IN–
CNV
25pF
250
VDD1
Figure 20. Equivalent Analog Input Circuit
The analog input structure allows the sampling of the true
differential signal between IN+ and IN. By using these differ-
ential inputs, signals common to both inputs are rejected. The
AD7625 shows some degradation in THD with higher analog
input frequencies.
40
45
50
55
60
65
70
75
80
85
1
10
100
1k
10k
100k
1M
10M
07652-
009
INPUT COMMON-MODE FREQUENCY (Hz)
CM
RR
(
d
B)
Figure 21. Analog Input CMRR vs. Frequency
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| AD7626BCPZ | 功能描述:IC ADC 16BIT 10MSPS DIFF 32LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極 |
| AD7626BCPZ-RL7 | 功能描述:IC ADC 16BIT 10MSPS DIFF 32LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極 |
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