Datasheet

  
  
SLAS272F − JULY 2000 − REVISED JUNE 2004
38
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature (unless otherwise
noted) (continued)
12-bit ADC, temperature sensor and built-in V
MID
PARAMETER TEST CONDITIONS MIN NOM MAX UNIT
I
SENSOR
Operating supply current into
REFON = 0, INCH = 0Ah,
2.2 V 40 120
A
I
SENSOR
Operating supply current into
AV
CC
terminal (see Note 1)
REFON = 0, INCH = 0Ah,
ADC12ON=NA, T
A
= 25_C
3 V 60 160
µA
V
SENSOR
†
ADC12ON = 1, INCH = 0Ah,
2.2 V 986 986±5%
mV
V
SENSOR
†
ADC12ON = 1, INCH = 0Ah,
T
A
= 0°C
3 V 986 986±5%
mV
TC
SENSOR
†
ADC12ON = 1, INCH = 0Ah
2.2 V 3.55 3.55±3%
mV/°C
TC
SENSOR
†
ADC12ON = 1, INCH = 0Ah
3 V 3.55 3.55±3%
mV/°C
t
SENSOR(sample)
†
Sample time required if channel
ADC12ON = 1, INCH = 0Ah,
2.2 V 30
s
t
SENSOR(sample)
†
Sample time required if channel
10 is selected (see Note 2)
ADC12ON = 1, INCH = 0Ah,
Error of conversion result ≤ 1 LSB
3 V 30
µs
I
VMID
Current into divider at channel 11
ADC12ON = 1, INCH = 0Bh
2.2 V NA
A
I
VMID
Current into divider at channel 11
(see Note 3)
ADC12ON = 1, INCH = 0Bh
3 V NA
µA
V
MID
AV
CC
divider at channel 11
ADC12ON = 1, INCH = 0Bh,
2.2 V 1.1 1.1±0.04
V
V
MID
AV
CC
divider at channel 11
ADC12ON = 1, INCH = 0Bh,
V
MID
is ~0.5 x V
AVCC
3 V 1.5 1.50±0.04
V
t
VMID(sample)
Sample time required if channel
ADC12ON = 1, INCH = 0Bh,
2.2 V 1400
ns
t
VMID(sample)
Sample time required if channel
11 is selected (see Note 4)
ADC12ON = 1, INCH = 0Bh,
Error of conversion result ≤ 1 LSB
3 V 1220
ns
†
Not production tested, limits characterized
NOTES: 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 typical equivalent impedance of the sensor is 51 kΩ. The sample time required includes the sensor-on time t
SENSOR(on)
.
3. No additional current is needed. The V
MID
is used during sampling.
4. The on-time t
VMID(on)
is included in the sampling time t
VMID(sample)
; no additional on time is needed.