TDA8779 Datasheet, PDF (2/20 Pages) NXP Semiconductors – 10-bit converter interface ADC/DAC for quadrature transceiver

Philips Semiconductors
10-bit converter interface (ADC/DAC) for
quadrature transceiver
Objective specification
TDA8779
FEATURES
• Two 10-bit ADCs with multiplexed outputs
• Two 10-bit DACs with multiplexed inputs
• Sampling rate for the ADCs and DACs up to 20 MHz
• Digital outputs (for the ADC) and inputs (for the DAC)
are TTL/CMOS compatible (2.7 to 5.5 V)
• Internal reference voltage regulator
• Power dissipation 520 mW
• Standby mode.
APPLICATIONS
Wireless communication.
GENERAL DESCRIPTION
The TDA8779 contains two 10-bit high speed ADCs and
two 10-bit DACs for wireless communication (for use in
transceiver modules). This device converts two analog
input signals (channels I and Q) and digital inputs
(D0 to D9) at a maximum sampling rate of 20 MHz.
The input bias voltages for the analog input voltages are
provided internally at the middle code. The analog input
and output voltages are AC coupled.
The data sampling is performed on the rising edge of the
clock for ADCs and DACs.
All reference voltages are generated internally.
QUICK REFERENCE DATA
SYMBOL
V_CCA1
V_CCD1
V_CCA2
V_CCD2
V_CCO
I_CCA
I_CCD
I_CCO
f_CLK(ADC)max
INLA
DNLA
f_CLK(DAC)max
INLD
DNLD
P_tot
PARAMETER
analog supply voltage for the
ADC part
digital supply voltage for the
ADC part
analog supply voltage for the
DAC part
digital supply voltage for the
DAC part
output stage supply voltage
analog supply current
digital supply current
output stage supply current
maximum clock frequency for
the ADC part
integral non linearity for the
ADC part
differential non linearity for
the ADC part
maximum clock frequency for
the DAC part
integral non linearity for the
DAC part
differential non linearity for
the DAC part
total power dissipation
CONDITIONS
ramp input; f_CLK = 20 MHz
full-scale; ramp input;
f_CLK = 20 MHz
50% full-scale; ramp input;
f_CLK = 20 MHz
full-scale; ramp input;
f_CLK = 20 MHz
full-scale; ramp input;
f_CLK = 20 MHz
MIN. TYP. MAX. UNIT
4.75 5.0 5.5 V
4.75 5.0 5.5 V
4.75 5.0 5.5 V
4.75 5.0 5.5 V
2.7 3.0 5.5 V
−
71
−
mA
−
31
−
mA
−
2
−
mA
20
−
−
MHz
−
±2
−
LSB
−
±0.3 −
LSB
20
−
−
MHz
−
±2
−
LSB
−
±0.75 −
LSB
−
520 −
mW
1996 Sep 18
2