參數(shù)資料
型號： TDA8769
廠商： NXP Semiconductors N.V.
英文描述： 12-bit, 60/80/105 Msps Analog-to-Digital Converter (ADC) Nyquist/high IF sampling
中文描述： 12位，60/80/105 Msps的模擬到數(shù)字轉(zhuǎn)換器（ADC）奈奎斯特/ IF采樣高
文件頁數(shù)： 14/28頁
文件大小： 217K
代理商： TDA8769
2003 Dec 09
14
Philips Semiconductors
Objective specification
12-bit, 60/80/105 Msps Analog-to-Digital Converter
(ADC) Nyquist/high IF sampling
TDA8769
11 APPLICATION INFORMATION
11.1
Output coding and control signals
Table 1
Output coding with differential inputs (typical values to AGND); V
IN(p
p)
V
INN(p
p)
= 1.9 V
0.5 dBFS;
V
VREF
= V
CCA3
1.75 V
Table 2
Mode selection
Table 3
Track-and-hold selection
Table 4
Complete conversion signal selection
11.2
TDA8769 in 3G radio receivers
TDA8769 has been proven in many 3G receivers with various operating conditions regarding input frequency, signal
input frequency bandwidth and sampling frequency. TDA8769 provides a maximum analog input frequency of 250 MHz.
It allows a significant cost reduction of the RF front-end, from two mixers to only one, even in multicarrier architecture.
Table 5 shows possible applications with the TDA8769 in High IF sampling mode.
CODE
V
IN(p-p)
V
INN(p-p)
IR
BINARY OUTPUTS
(D11 TO D0)
TWO’S COMPLEMENT
OUTPUTS (D11 TO D0)
Underflow
0
1
:
2047
:
4094
4095
Overflow
<2.925
2.925
:
3.4
:
3.875
>3.875
>3.875
3.875
:
3.4
:
2.925
<2.925
0
1
0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 1
:
0 1 1 1 1 1 1 1 1 1 1 1
:
1 1 1 1 1 1 1 1 1 1 1 0
1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 1
1 0 0 0 0 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0 0 0 0 1
:
1 1 1 1 1 1 1 1 1 1 1 1
:
0 1 1 1 1 1 1 1 1 1 1 0
0 1 1 1 1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 1 1 1 1 1
0
CONTROL INPUT TWO’S
COMPLEMENT OUTPUT
(OTC)
CHIP ENABLE NOT
(CEN)
OUTPUT DATA (D0 TO D11 AND IR)
0
1
0
0
1
binary; active
two’s complement; active
high impedance
don’t care
CONTROL INPUT TRACK-AND-HOLD (TH)
MODE
1
0
active
inactive; tracking
DEL1
DEL0
OUTPUT SIGNAL
0
0
1
1
0
1
0
1
inactive
active (for timing values, see Chapter 10)
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