MAX1196ECM+D Maxim Integrated Products, MAX1196ECM+D Datasheet - Page 17

• Manufacturer Part Number: MAX1196ECM+D
• Description: IC ADC 8BIT 40MSPS DL 48-TQFP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1196ECM+D

• Number Of Bits: 8
• Sampling Rate (per Second): 40M
• Data Interface: Parallel
• Number Of Converters: 2
• Power Dissipation (max): 108mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFP Exposed Pad, 48-eTQFP, 48-HTQFP, 48-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

In general, the MAX1196 provides better SFDR and
THD with fully differential input signals than single-
ended drive, especially for very high input frequencies.
In differential input mode, even-order harmonics are
lower as both inputs (INA+, INA- and/or INB+, INB-) are
balanced, and each of the ADC inputs only requires
half the signal swing compared to single-ended mode.
Figure 7 shows an AC-coupled, single-ended applica-
tion. Amplifiers like the MAX4108 provide high speed,
high bandwidth, low noise, and low distortion to main-
tain the integrity of the input signal.
Figure 6. Transformer-Coupled Input Drive
Internal Reference and Multiplexed Parallel Outputs
V
V
IN
IN
N.C.
Single-Ended AC-Coupled Input Signal
N.C.
0.1µF
0.1µF
Dual 8-Bit, 40Msps, 3V, Low-Power ADC with
MINICIRCUITS
MINICIRCUITS
3
3
1
2
TT1-6-KK81
1
2
TT1-6-KK81
T1
T1
6
5
4
6
5
4
______________________________________________________________________________________
2.2µF
2.2µF
25Ω
25Ω
25Ω
25Ω
0.1µF
0.1µF
22pF
22pF
22pF
22pF
INA+
COM
INA-
INB+
INB-
MAX1196
Multiple-converter systems based on the MAX1196 are
well suited for use with a common reference voltage.
The REFIN pin of those converters can be connected
directly to an external reference source.
A precision bandgap reference like the MAX6062 gen-
erates an external DC level of 2.048V (Figure 8), and
exhibits a noise voltage density of 150nV/√Hz. Its out-
put passes through a one-pole lowpass filter (with 10Hz
cutoff frequency) to the MAX4250, which buffers the
reference before its output is applied to a second 10Hz
lowpass filter. The MAX4250 provides a low offset volt-
age (for high gain accuracy) and a low noise level. The
passive 10Hz filter following the buffer attenuates noise
Figure 7. Using an Op Amp for Single-Ended, AC-Coupled
Input Drive
V
V
IN
IN
MAX4108
MAX4108
Buffered External Reference Drives
100Ω
100Ω
100Ω
100Ω
0.1µF
0.1µF
REFN
REFN
REFP
REFP
1kΩ
1kΩ
1kΩ
1kΩ
R
50Ω
R
50Ω
0.1µF
0.1µF
ISO
ISO
22pF
22pF
22pF
22pF
50Ω
C
50Ω
C
R
R
C
C
ISO
IN
IN
ISO
IN
IN
Multiple ADCs
INA+
COM
INA-
INB+
INB-
MAX1196
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