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參數(shù)資料
| 型號： | TDA8769HW/8 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | ADC |
| 英文描述： | 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
| 封裝： | 7 X 7 MM, 1.0 MM HEIGHT, PLASTIC, HTQFP-48 |
| 文件頁數(shù)： | 6/28頁 |
| 文件大小： | 232K |
| 代理商： | TDA8769HW/8 |
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2003 Dec 09
14
Philips Semiconductors
Objective specication
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); VIN(pp) VINN(pp) = 1.9 V 0.5 dBFS;
VVREF =VCCA3 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
VIN(p-p)
VINN(p-p)
IR
BINARY OUTPUTS
(D11 TO D0)
TWO’S COMPLEMENT
OUTPUTS (D11 TO D0)
Underow
<2.925
>3.875
0
0 0 0 0 0 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0 0 0 0 0
0
2.925
3.875
1
0 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 0 1
1 0 0 0 0 0 0 0 0 0 0 1
::
:
2047
3.4
0 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 1
::
:
4094
1 1 1 1 1 1 1 1 1 1 1 0
0 1 1 1 1 1 1 1 1 1 1 0
4095
3.875
2.925
1 1 1 1 1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 1 1 1 1 1
Overow
>3.875
<2.925
0
1 1 1 1 1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 1 1 1 1 1
CONTROL INPUT TWO’S
COMPLEMENT OUTPUT
(OTC)
CHIP ENABLE NOT
(CEN)
OUTPUT DATA (D0 TO D11 AND IR)
0
binary; active
1
0
two’s complement; active
don’t care
1
high impedance
CONTROL INPUT TRACK-AND-HOLD (TH)
MODE
1
active
0
inactive; tracking
DEL1
DEL0
OUTPUT SIGNAL
0
inactive
0
1
active (for timing values, see Chapter 10)
10
11
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