tda8769hw/8 NXP Semiconductors, tda8769hw/8 Datasheet - Page 14

• Manufacturer Part Number: tda8769hw/8
• Description: 12-bit, 60/80/105 Msps Analog-to-digital Converter Adc Nyquist/high If Sampling
• Manufacturer: NXP Semiconductors

Philips Semiconductors
11 APPLICATION INFORMATION
11.1
Table 1 Output coding with differential inputs (typical values to AGND); V
Table 2 Mode selection
Table 3 Track-and-hold selection
Table 4 Complete conversion signal selection
11.2
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.
2003 Dec 09
Underflow
0
1
:
2047
:
4094
4095
Overflow
CONTROL INPUT TWO’S
COMPLEMENT OUTPUT
12-bit, 60/80/105 Msps Analog-to-Digital Converter
(ADC) Nyquist/high IF sampling
CODE
Output coding and control signals
TDA8769 in 3G radio receivers
CONTROL INPUT TRACK-AND-HOLD (TH)
V
don’t care
VREF
(OTC)
DEL1
0
1
0
0
1
1
= V
V
<2.925
>3.875
2.925
3.875
CCA3
IN(p-p)
3.4
:
:
1.75 V
1
0
V
>3.875
<2.925
CHIP ENABLE NOT
3.875
2.925
INN(p-p)
3.4
:
:
(CEN)
DEL0
0
0
1
0
1
0
1
IR
0
1
0
14
binary; active
two’s complement; active
high impedance
active
inactive; tracking
inactive
active (for timing values, see Chapter 10)
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
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
BINARY OUTPUTS
(D11 TO D0)
OUTPUT DATA (D0 TO D11 AND IR)
:
:
IN(p p)
OUTPUT SIGNAL
V
INN(p p)
MODE
= 1.9 V
OUTPUTS (D11 TO D0)
TWO’S COMPLEMENT
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
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
Objective specification
0.5 dBFS;
TDA8769
:
: