L7250
ELECTRICAL CHARACTERISTCS (continued)
POWER SUPPLY [VCC5 & VCV] VCC5 = 5V ±10%, VCV = 12V ±10%. T
= 25°C (unless otherwise specified)
amb
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
ADC AUXILIARY INPUT
AUX_ran Input range 0
ge0
Reg06H ‘b3’ = 0
Referred to Vref25
±1
V
V
AUX_ran Input range 1
ge1
Reg06H ‘b3’ = 1
Referred to Vref25
±2.25
AUX_Ibias Input bias
-100
100
+15
µA
VCM VOLTAGE AMPLIFIER
Volt_gain Voltage gain
Volt_off Input offset
0.165
V/V
mV
dB
-15
46
Volt
Common mode rejection ratio
f < 10 KHz, tested at DC only
CMRR=A
_cmrr
V DIFF/AV CM
Volt
_svrr
supply voltage rejection ratio
f < 10 KHz, tested at DC only
60
dB
V
BEMF processor amplifier
CalCoar Calcoarse voltage input range
seIn
0.5
2
Gain1
Gain2
Offset
First stage gain
Vcontrol = 1.25 V
1.91
16
V/V
V/V
mV
Second stage gain
Residual input offset after
calibration
Vcontrol = 1.25V
(Measured between VCMN and
SNS_P pins)
-3
+3
Rout
BEMF amp output resistance (pin
31)
500
ohm
ULOAD @ POR
Timer1_V Timer1 Charging Voltage
2.5
2
V
µA
V
Timer1_I Timer1 Discharging Current
Timer1_T Timer1 Low threshold
0.2
VOLTAGE REGULATORS
1.8 AND 3.3 LINEAR REGULATOR
V18 feed 1.8V feedback Voltage
V33 OUT 3.3V Output Voltage
-5%
-5%
1.25
3.3
+5%
+5%
V
V
9/46
STMICROELECTRONICS [ ST ]
