ADS7945 Datasheet, PDF (6/49 Pages) Texas Instruments – 14-Bit, 2 MSPS, Dual-Channel, Differential/Single-Ended, Ultralow-Power Analog-to-Digital Converters

ADS7945
ADS7946
SBAS539B – JUNE 2011 – REVISED SEPTEMBER 2011
www.ti.com
ELECTRICAL CHARACTERISTICS: ADS7946 (Single-Ended) (continued)
Minimum/maximum specifications at T_A = –40°C to +125°C, AVDD = 2.7 V to 5.25 V, DVDD = 1.65 V to AVDD,
and f_SAMPLE = 2 MSPS, unless otherwise noted.
Typical specifications at T_A = +25°C, AVDD = 5 V, DVDD = 1.8 V, and f_SAMPLE = 2 MSPS.
PARAMETER
TEST CONDITIONS
MIN TYP
MAX
POWER-SUPPLY REQUIREMENTS
AVDD
2.7
3.3
5.25
DVDD
1.65
3.3
AVDD
AVDD supply current
I_DYNAMIC
I_STATIC
AVDD = 3.3 V, f_SAMPLE = 2 MSPS
AVDD = 5 V, f_SAMPLE = 2 MSPS
AVDD = 3.3 V, SCLK off
AVDD = 5 V, SCLK off
3.5
4
4
5
2.3
2.5
3
DVDD supply current⁽⁸⁾
DVDD = 3.3 V, f_SAMPLE = 2 MSPS,
SDO load 20 pF
750
Power-down state
I_PD-DYNAMIC
SCLK = 40 MHz
550
AVDD supply current _IPD-STATIC
SCLK off
2.5
Power-up time
From power-down state using PDEN pin
1
TEMPERATURE RANGE
Specified performance
–40
+125
UNITS
V
V
mA
mA
mA
mA
µA
µA
µA
µs
°C
(8) DVDD consumes only dynamic current. I_DVDD = C_LOAD × DVDD × number of 0→1 transitions in SDO × f_SAMPLE.
This is a load-dependent current and there is no DVDD current when the output is not toggling.
THERMAL INFORMATION
THERMAL METRIC⁽¹⁾
ADS7945/6
RTE
UNITS
16 PINS
θ_JA
θ_JCtop
θ_JB
ψ_JT
ψ_JB
θ_JCbot
Junction-to-ambient thermal resistance
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
Junction-to-top characterization parameter
Junction-to-board characterization parameter
Junction-to-case (bottom) thermal resistance
54.3
53.7
19.2
°C/W
0.3
14.5
5.2
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
6
Submit Documentation Feedback
Copyright © 2011, Texas Instruments Incorporated
Product Folder Link(s): ADS7945 ADS7946