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參數資料
| 型號： | 935261327557 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | ADC |
| 英文描述： | DUAL 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP64 |
| 封裝： | PLASTIC, SOT-314-2, LQFP-64 |
| 文件頁數： | 21/26頁 |
| 文件大小： | 262K |
| 代理商： | 935261327557 |
1999 Sep 16
4
Philips Semiconductors
Objective specication
Dual 8-bit, 100 Msps A/D converter with
DPGA
TDA8798
PINNING
SYMBOL
PIN
DESCRIPTION
DPGA2N
1
DPGA2 inverting output
DPGA2
2
DPGA2 non-inverting output
DPGAC2
3
DPGA2 bandwidth limitation control
Vref2
4
ADC2 reference output
VDDA2
5
DPGA2 analog supply voltage
VIN2N
6
DPGA2 inverting input voltage
VIN2
7
DPGA2 non-inverting input voltage
VSSA2
8
DPGA2 analog ground
VSSA1
9
DPGA1 analog ground
VIN1
10
DPGA1 non-inverting input voltage
VIN1N
11
DPGA1 inverting input voltage
VDDA1
12
DPGA1 analog supply voltage
Vref1
13
ADC1 reference output
DPGAC1
14
DPGA1 bandwidth limitation control
DPGA1
15
DPGA1 non-inverting output
DPGA1N
16
DPGA1 inverting output
Fig.2 External filter.
External filtering may be used between DPGA and ADC to limit the noise bandwidth.
The external filter has a low-pass cut-off frequency of
.
and a high-pass cut-off frequency of
.
Other types of filter may be used if DC biasing is correct.
f
l
3dB
–
()
1
2
π
-------
R2
R
oDPGA
()
+
L
------------------------------------------
×
≈
f
h
3dB
–
()
1
2
π
-------
1
R
iADC
()
C
×
------------------------------
×
≈
(1) DPGA1/DPGA2
(2) BUF1/BUF2
(3) DPGA1N/DPGA2N
(4) BUF1N/BUF2N
handbook, full pagewidth
FCE267
IOUT
I
OUT
Co(DPGA)
TDA8798
10
H
L
10
H
100 nF
C
L
Co(DPGA)
Ro(DPGA)
DPGA(1)
BUF(2)
BUFN(4)
R
1 k
DPGAN(3)
Ro(DPGA)
Ri(ADC)
Ci(ADC)
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