Datasheet
MAX1191
Ultra-Low-Power, 7.5Msps, Dual 8-Bit ADC
6 _______________________________________________________________________________________
FFT PLOT CHANNEL A (DIFFERENTIAL INPUTS,
8192-POINT DATA RECORD)
MAX1191 toc01
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
3.53.02.0 2.51.0 1.50.5
-80
-70
-60
-50
-40
-30
-20
-10
0
-90
04.0
f
CLK
= 7.500567MHz
f
INA
= 1.000747MHz
f
INB
= 3.020553MHz
A
INA
= A
INB
= -0.5dB FS
f
INB
HD3
HD2
FFT PLOT CHANNEL B (DIFFERENTIAL INPUTS,
8192-POINT DATA RECORD)
MAX1191 toc02
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
3.53.02.0 2.51.0 1.50.5
-80
-70
-60
-50
-40
-30
-20
-10
0
-90
04.0
f
CLK
= 7.500567MHz
f
INA
= 1.000747MHz
f
INB
= 3.020553MHz
A
INA
= A
INB
= -0.5dB FS
f
INA
HD3
HD2
FFT PLOT CHANNEL A (DIFFERENTIAL INPUTS,
8192-POINT DATA RECORD)
MAX1191 toc03
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
3.53.02.0 2.51.0 1.50.5
-80
-70
-60
-50
-40
-30
-20
-10
0
-90
04.0
f
CLK
= 7.500567MHz
f
INA
= 3.020553MHz
f
INB
= 1.000747MHz
A
INA
= A
INB
= -0.5dB FS
f
INB
HD3
HD2
FFT PLOT CHANNEL B (DIFFERENTIAL INPUTS,
8192-POINT DATA RECORD)
MAX1191 toc04
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
3.53.02.0 2.51.0 1.50.5
-80
-70
-60
-50
-40
-30
-20
-10
0
-90
04.0
f
CLK
= 7.500567MHz
f
INA
= 3.020553MHz
f
INB
= 1.000747MHz
A
INA
= A
INB
= -0.5dB FS
f
INA
HD3
HD2
TWO-TONE IMD PLOT (DIFFERENTIAL INPUTS,
8192-POINT DATA RECORD)
MAX1191 toc05
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
3.53.02.0 2.51.0 1.50.5
-80
-70
-60
-50
-40
-30
-20
-10
0
-90
04.0
f
IN2
f
IN1
f
CLK
= 7.500567MHz
f
IN1
= 1.8MHz
f
IN2
= 2.3MHz
A
IN
= -7dB FS
Typical Operating Characteristics
(V
DD
= 3.0V, OV
DD
= 1.8V, V
REFIN
= V
DD
(internal reference), C
L
≈ 10pF at digital outputs, differential input at -0.5dB FS, f
CLK
=
7.500567MHz at 50% duty cycle, T
A
= +25°C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 3.0V, OV
DD
= 1.8V, V
REFIN
= V
DD
(internal reference), C
L
≈ 10pF at digital outputs, f
CLK
= 7.5MHz, C
REFP
= C
REFN
= C
COM
= 0.33µF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
Note 1: Specifications ≥+25°C guaranteed by production test, <+25°C guaranteed by design and characterization.
Note 2: SNR, SINAD, SFDR, HD3, and THD are based on a differential analog input voltage of -0.5dB FS referenced to the
amplitude of the digital output. SNR and THD are calculated using HD2 through HD6.
Note 3: The power consumption of the output driver is proportional to the load capacitance (C
L
).
Note 4: Guaranteed by design and characterization. Not production tested.
Note 5: SINAD settles to within 0.5dB of its typical value.
Note 6: Crosstalk rejection is measured by applying a high-frequency test tone to one channel and a low-frequency tone to the
second channel. FFTs are performed on each channel. The parameter is specified as power ratio of the first and second
channel FFT test tone bins.
Note 7: Amplitude/phase matching is measured by applying the same signal to each channel, and comparing the magnitude and
phase of the fundamental bin on the calculated FFT.