MAX1191 Datasheet, PDF (6/27 Pages) Maxim Integrated Products – Ultra-Low-Power, 7.5Msps, Dual 8-Bit ADC

Ultra-Low-Power, 7.5Msps, Dual 8-Bit ADC
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 (CL).
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.
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.)
FFT PLOT CHANNEL A (DIFFERENTIAL INPUTS,
8192-POINT DATA RECORD)
0
f_CLK = 7.500567MHz
-10
f_INA = 1.000747MHz
-20
f_INB = 3.020553MHz
A_INA = A_INB = -0.5dB FS
-30
-40
-50
-60
HD2
HD3 _fINB
-70
-80
-90
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
ANALOG INPUT FREQUENCY (MHz)
FFT PLOT CHANNEL B (DIFFERENTIAL INPUTS,
8192-POINT DATA RECORD)
0
f_CLK = 7.500567MHz
-10 f_INA = 1.000747MHz
-20
f_INB = 3.020553MHz
A_INA = A_INB = -0.5dB FS
-30
-40
-50
HD3
-60
f_INA HD2
-70
-80
-90
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
ANALOG INPUT FREQUENCY (MHz)
FFT PLOT CHANNEL A (DIFFERENTIAL INPUTS,
8192-POINT DATA RECORD)
0
f_CLK = 7.500567MHz
-10 f_INA = 3.020553MHz
-20
f_INB = 1.000747MHz
A_INA = A_INB = -0.5dB FS
-30
-40
-50
-60
f_{INB HD2 HD3}
-70
-80
-90
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
ANALOG INPUT FREQUENCY (MHz)
FFT PLOT CHANNEL B (DIFFERENTIAL INPUTS,
8192-POINT DATA RECORD)
0
f_CLK = 7.500567MHz
-10
f_INA = 3.020553MHz
-20
f_INB = 1.000747MHz
A_INA = A_INB = -0.5dB FS
-30
-40
-50
-60
HD2
HD3 f_INA
-70
-80
-90
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
ANALOG INPUT FREQUENCY (MHz)
TWO-TONE IMD PLOT (DIFFERENTIAL INPUTS,
8192-POINT DATA RECORD)
0
f_CLK = 7.500567MHz
-10 f_IN1 = 1.8MHz
-20
f_IN2 = 2.3MHz
A_IN = -7dB FS
-30
-40
f_IN1
f_IN2
-50
-60
-70
-80
-90
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
ANALOG INPUT FREQUENCY (MHz)
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