TDA8793 Datasheet, PDF (9/20 Pages) NXP Semiconductors – 8-bit, low-power, 3 V, 100 Msps Analog-to-Digital Converter ADC

Philips Semiconductors
8-bit, low-power, 3 V, 100 Msps
Analog-to-Digital Converter (ADC)
Preliminary specification
TDA8793
Notes
1. It is possible to use the reference output voltage (pin SDN) to drive other analog circuits under the limits indicated.
2. In addition to a good layout of the digital and analog grounds, it is recommended that the rise and fall times of the
clock must be not less than 0.75 ns.
3. It is possible with an external reference voltage connected to REFIN pin to adjust the ADC input range. The input
range variation will be fixed.
4. Effective bits are obtained via a Fast Fourier Transform (FFT) treatment taking 8 k acquisition points per equivalent
fundamental period. The calculation takes into account all harmonics and noise up to half of the clock frequency
(nyquist frequency). Conversion to signal-to-noise ratio: SINAD = 6.02 × EB + 1.76 dB.
Table 1 Standby selection
PIN STDBY
LOW
HIGH
D0 TO D7
inactive
active; output logic state LOW
I_CCA + I_CCD
56 mA
0.7 mA
Table 2 Track-and-hold selection
PIN TEN
LOW
HIGH
TRACK-AND-HOLD
active
inactive; tracking mode
Table 3 Output coding and input voltage (typical values; referenced to AGND); V_REFIN = 1.27 V
STEP
V_INP (V)
V_INN (V)
BINARY OUTPUT BITS
D7
D6
D5
D4
D3
D2
D1
D0
Underflow
0
1
...
127
...
254
255
Overflow
<1.6
1.6
...
...
1.85
...
...
2.1
>2.1
>2.1
0
0
0
0
0
0
0
0
2.1
0
0
0
0
0
0
0
0
...
0
0
0
0
0
0
0
1
...
...
...
...
...
...
...
...
...
1.85
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
1
1
1
1
1
1
1
0
1.6
1
1
1
1
1
1
1
1
<1.6
1
1
1
1
1
1
1
1
1999 Oct 06
9