Datasheet

MSP430F261x
MSP430F241x
SLAS541K –JUNE 2007–REVISED NOVEMBER 2012 www.ti.com
12-Bit ADC Temperature Sensor and Built-In V
MID
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
Operating supply 2.2 V 40 120
REFON = 0, INCH = 0Ah,
I
SENSOR
current into AV
CC
µA
ADC12ON = 1, T
A
= 25°C
3V 60 160
terminal
(1)
2.2 V 986
V
SENSOR
(2) (3)
ADC12ON = 1, INCH = 0Ah, T
A
= 0°C mV
3V 986
2.2 V 3.55
TC
SENSOR
(3)
ADC12ON = 1, INCH = 0Ah mV/°C
3V 3.55
Sample time 2.2 V 30
ADC12ON = 1, INCH = 0Ah,
t
SENSOR(sample)
(3)
required if channel µs
Error of conversion result ≤ 1 LSB
3V 30
10 is selected
(4)
2.2 V NA
(5)
Current into divider
I
VMID
ADC12ON = 1, INCH = 0Bh µA
at channel 11
(5)
3V NA
(5)
2.2 V 1.1 1.1 ± 0.04
AV
CC
divider at ADC12ON = 1, INCH = 0Bh,
V
MID
V
channel 11 V
MID
is approximately 0.5 × V
AVCC
3V 1.5 1.5 ± 0.04
Sample time 2.2 V 1400
ADC12ON = 1, INCH = 0Bh,
t
VMID(sample)
required if channel ns
Error of conversion result ≤ 1 LSB
3 V 1220
11 is selected
(6)
(1) The sensor current I
SENSOR
is consumed if (ADC12ON = 1 and REFON = 1), or (ADC12ON = 1 AND INCH = 0Ah and sample signal is
high). Therefore it includes the constant current through the sensor and the reference.
(2) The temperature sensor offset can be as much as ±20°C. A single-point calibration is recommended to minimize the offset error of the
built-in temperature sensor.
(3) Limits characterized
(4) The typical equivalent impedance of the sensor is 51 kΩ. The sample time required includes the sensor-on time t
SENSOR(on)
(5) No additional current is needed. The V
MID
is used during sampling.
(6) The on-time t
VMID(on)
is included in the sampling time t
VMID(sample)
, no additional on time is needed.
12-Bit DAC Supply Specifications
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS V
CC
T
A
MIN TYP MAX UNIT
AV
CC
Analog supply voltage AV
CC
= DV
CC
, AV
SS
= DV
SS
= 0 V 2.2 3.6 V
-40°C to 85°C 50 110
DAC12AMPx = 2, DAC12IR = 0,
2.2 V, 3 V
DAC12_xDAT = 0x0800
105°C 69 150
DAC12AMPx = 2, DAC12IR = 1,
DAC12_xDAT = 0x0800, 2.2 V, 3 V 50 130
V
eREF+
= V
REF+
= AV
CC
Supply current, single
I
DD
µA
DAC12AMPx = 5, DAC12IR = 1,
DAC channel
(1)(2)
DAC12_xDAT = 0x0800, 2.2 V, 3 V 200 440
V
eREF+
= V
REF+
= AV
CC
DAC12AMPx = 7, DAC12IR = 1,
DAC12_xDAT = 0x0800, 2.2 V, 3 V 700 1500
V
eREF+
= V
REF+
= AV
CC
DAC12_xDAT = 800h, V
REF
= 1.5 V,
2.2 V 70
ΔAV
CC
= 100 mV
Power-supply rejection
PSRR dB
DAC12_xDAT = 800h,
ratio
(3)(4)
V
REF
= 1.5 V or 2.5 V, 3 V 70
ΔAV
CC
= 100 mV
(1) No load at the output pin, DAC12_0 or DAC12_1, assuming that the control bits for the shared pins are set properly.
(2) Current into reference terminals not included. If DAC12IR = 1 current flows through the input divider; see Reference Input specifications.
(3) PSRR = 20 × log(ΔAV
CC
/ΔV
DAC12_xOUT
)
(4) V
REF
is applied externally. The internal reference is not used.
66 Submit Documentation Feedback Copyright © 2007–2012, Texas Instruments Incorporated