MAX1034_12 Datasheet, PDF (6/31 Pages) Maxim Integrated Products – 8-/4-Channel, ±VREF Multirange Inputs,Serial 14-Bit ADCs

8-/4-Channel, ±V_REF Multirange Inputs,
Serial 14-Bit ADCs
ELECTRICAL CHARACTERISTICS (continued)
(V_AVDD1 = V_AVDD2 = V_DVDD = V_DVDDO = 5V, V_AGND1 = V_DGND = V_DGNDO = V_AGND2 = V_AGND3 = 0V, f_CLK = 3.5MHz (50% duty cycle),
external clock mode, V_REF = 4.096V (external reference operation), REFCAP = AVDD1, maximum single-ended bipolar input range (±V_REF),
C_DOUT = 50pF, C_SSTRB = 50pF, T_A = -40°C to +85°C, unless otherwise noted. Typical values are at T_A = +25°C.)
Note 1: Parameter tested at V_AVDD1 = V_AVDD2 = V_DVDD = V_DVDDO = 5V.
Note 2: See definitions in the Parameter Definitions section at the end of the data sheet.
Note 3: Guaranteed by correlation with single-ended measurements.
Note 4: Not production tested. Guaranteed by design.
Note 5: To ensure external reference operation, V_REFCAP must exceed (V_AVDD1 - 0.1V). To ensure internal reference operation, V_REFCAP
must be below (V_AVDD1 - 0.4V). Bypassing REFCAP with a 0.1µF or larger capacitor to AGND1 sets V_REFCAP ≈ 4.096V. The tran-
sition point between internal reference mode and external reference mode lies between the REFCAP buffer disable threshold
minimum and maximum values (Figures 17 and 18).
Note 6: The SCLK duty cycle can vary between 40% and 60%, as long as the t_CL and t_CH timing requirements are met.
Typical Operating Characteristics
(V_AVDD1 = V_AVDD2 = V_DVDD = V_DVDDO = 5V, V_AGND1 = V_DGND = V_DGNDO = V_AGND2 = V_AGND3 = 0V, f_CLK = 3.5MHz (50% duty
cycle), external clock mode, V_REF = 4.096V (external reference operation), REFCAP = AVDD1, maximum single-ended bipolar input
range (±V_REF), C_DOUT = 50pF, C_SSTRB = 50pF, unless otherwise noted.)
ANALOG SUPPLY CURRENT
vs. ANALOG SUPPLY VOLTAGE
2.60
EXTERNAL CLOCK MODE
2.55
T_A = +85°C
2.50
2.45
T_A = +25°C
2.40
T_A = -40°C
2.35
2.30
4.75 4.85 4.95 5.05 5.15 5.25
V_AVDD1 (V)
PREAMPLIFIER SUPPLY CURRENT
vs. PREAMPLIFIER SUPPLY VOLTAGE
24
EXTERNAL CLOCK MODE
23
22
21
T_A = +85°C
20
19
T_A = +25°C
18
17
T_A = -40°C
16
15
4.75 4.85 4.95 5.05 5.15 5.25
V_AVDD2 (V)
DIGITAL SUPPLY CURRENT
vs. DIGITAL SUPPLY VOLTAGE
0.90
EXTERNAL CLOCK MODE
0.85
T_A = +85°C
0.80
T_A = +25°C
0.75
T_A = -40°C
0.70
0.65
4.75 4.85 4.95 5.05 5.15 5.25
V_DVDD (V)
6 _______________________________________________________________________________________