參數(shù)資料
型號(hào)： AD7626BCPZ-RL7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 8/28頁(yè)
文件大?。?/td> 0K
描述： IC ADC 16BIT 10MSPS DIFF 32LFCSP
設(shè)計(jì)資源： Single-Ended-to-Differential High Speed Drive Circuit for 16-Bit, 10 MSPS AD7626 ADC (CN0105)
標(biāo)準(zhǔn)包裝： 1,500
位數(shù)： 16
采樣率（每秒）： 10M
數(shù)據(jù)接口： 串行
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 170mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 32-VFQFN 裸露焊盤(pán)，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(lèi)型： 2 個(gè)單端，單極；1 個(gè)差分，雙極
AD7626
Data Sheet
Rev. B | Page 16 of 28
TRANSFER FUNCTIONS
The AD7626 uses a 4.096 V reference. The AD7626 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 AD7626 are shown in
100 ... 000
100 ... 001
100 ... 010
011 ... 101
011 ... 110
011 ... 111
AD
C
CO
DE
(
T
W
O
S
C
O
M
P
L
E
M
E
NT
)
ANALOG INPUT
+FSR – 1.5LSB
+FSR – 1LSB
–FSR + 1LSB
–FSR
–FSR + 0.5LSB
0
76
48
-03
1
Figure 28. 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
+4.095875V
0x7FFF
Midscale + 1 LSB
+125 μV
0x0001
Midscale
0 V
0x0000
Midscale 1 LSB
125 μV
0xFFFF
FSR + 1 LSB
4.095875 V
0x8001
FSR
4.096 V
0x8000
ANALOG INPUTS
The analog inputs, IN+ and IN, applied to the AD7626 must be
180° out of phase with each other. Figure 29 shows an equivalent
circuit of the input structure of the AD7626.
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 33) 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.
67 25pF
VDD1
CNV
IN+
OR IN–
0
76
48
-0
10
Figure 29. 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
AD7626 shows some degradation in THD with higher analog
input frequencies.
45
50
55
60
65
70
75
1
10
100
1k
10k
100k
1M
10M
INPUT COMMON-MODE FREQUENCY (Hz)
CM
R
(
d
B)
0
76
48
-009
Figure 30. Analog Input CMRR vs. Frequency
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