Datasheet

MAX1036–MAX1039
2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/12-Channel 2-Wire Serial 8-Bit ADCs
20 ______________________________________________________________________________________
Differential Nonlinearity
Differential nonlinearity (DNL) is the difference between
an actual step width and the ideal value of 1LSB. A
DNL error specification of less than 1LSB guarantees
no missing codes and a monotonic transfer function.
Aperture Jitter
Aperture jitter (t
AJ
) is the sample-to-sample variation in
the time between the samples.
Aperture Delay
Aperture delay (t
AD
) is the time between the rising
edge of the sampling clock and the instant when an
actual sample is taken.
Signal-to-Noise Ratio
For a waveform perfectly reconstructed from digital sam-
ples, signal-to-noise ratio (SNR) is the ratio of full-scale
analog input (RMS value) to the RMS quantization error
(residual error). The ideal, theoretical minimum analog-
to-digital noise is caused by quantization error only and
results directly from the ADC’s resolution (N bits):
SNR = (6.02

N + 1.76)dB
INPUT VOLTAGE (LSB)
OUTPUT CODE
1...111
1...110
1...101
1...100
0...000
0...001
0...010
0...011
23
256
V
REF
1LSB =
1 253 255254
REF
2560 252
Figure 12. Unipolar Transfer Function
INPUT VOLTAGE (LSB)
OUTPUT CODE
(TWO'S COMPLEMENT)
0...111
0...110
0...101
0...100
1...000
1...001
1...010
1...011
-1-126 -125
256
V
REF
1LSB =
0+1-127 +125 +127+126
0...000
0...001
1...111
REF
+128-128 +124
'-' INPUT
Figure 13. Bipolar Transfer Function
3V/5V
V
LOGIC
= 3V/5V
GND
SUPPLIES
DGND3V/5V
GND
0.1μF
V
DD
DIGITAL
CIRCUITRY
MAX1036
MAX1037
MAX1038
MAX1039
R* = 5Ω
*OPTIONAL
Figure 14. Power-Supply and Grounding Connections