TDA8798 Datasheet, PDF (2/24 Pages) NXP Semiconductors – Dual 8-bit, 100 Msps A/D converter with DPGA

Philips Semiconductors
Dual 8-bit, 100 Msps A/D converter with
DPGA
Objective specification
TDA8798
FEATURES
• Dual 8-bit Analog-to-Digital Converter (ADC)
• Sampling rate up to 100 million samples per
second (Msps)
• Dual 34 dBV 6-bit Digitally Programmable Gain
Amplifier (DPGA) with optional power-off
• Optional external equalization filter with capacitive
coupling between DPGA and ADC
• Serial Interface (SI) for DPGA gain control using either
parallel load mode or count-up/count-down mode
• 3.3 V TTL/CMOS compatible I/O
• Differential or single-ended TTL/CMOS clock interface
• AC or DC coupling for DPGA inputs.
APPLICATIONS
• High-dynamic range acquisition front-ends
• Digital data storage read channels.
GENERAL DESCRIPTION
The TDA8798 is a dual 8-bit ADC with DPGA.
The 100 Msps maximum sampling rate and 34 dBV DPGA
gain range optimizes the ADC for high dynamic range
applications.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
V_DDA
V_DDD
V_DDO
I_DDA
analog supply voltage
digital supply voltage
output stage supply voltage
analog supply current
with DPGAEN LOW
with DPGAEN HIGH
I_DDD
I_DDO
INL
digital supply current
output stage supply current
DC integral non-linearity
from IC analog input to digital
output; ramp input;
f_CLK = 100 MHz
with DPGA at G_(min)
without DPGA
DNL
DC differential non-linearity
from IC analog input to digital
output; ramp input;
f_CLK = 100 MHz
with DPGA at G_(min)
without DPGA
V_n(o)(rms)
output referred noise (RMS value) DPGA at G_(max); Z_i = 50 Ω;
noise bandwidth = 15 MHz
B_{(−3dB)(ADC)}
B_{(−3dB)(DPGA)}
f_{(sample)(max)}
P_tot
ADC −3 dB analogue bandwidth
DPGA −3 dB bandwidth
maximum sampling rate
total power dissipation
at V_i(dif)(FS)
at V_i(dif)(max)
with DPGAEN LOW
with DPGAEN HIGH
MIN.
3.15
3.0
2.7
−
−
−
−
TYP.
3.3
3.3
3.3
106
tbf
30
3
MAX. UNIT
3.45 V
3.6 V
3.6 V
−
mA
−
mA
−
mA
−
mA
−
±3.0 tbf LSB
−
±1.0 tbf LSB
−
±0.5 tbf LSB
−
±0.5 tbf LSB
−
tbf 2
mV_rms
−
120 −
MHz
30
tbf
−
MHz
100 −
−
Msps
−
460 500 mW
−
tbf tbf mW
1999 Sep 16
2