Linear Technology LTC6804-1 - Page 11

LTC6804-1/LTC6804-2
11
680412fc
For more information www.linear.com/LTC6804-1
Typical perForMance characTerisTics
Measurement Gain Error
Hysteresis, Hot
Measurement Gain Error
Hysteresis, Cold Noise Filter Response
Measurement Error vs V
REG
Measurement Error V
+
PSRR
vs Frequency
Measurement Error V
REG
PSRR
vs Frequency
T
A
= 25°C, unless otherwise noted.
CHANGE IN GAIN ERROR (ppm)
–50
NUMBER OF PARTS
15
20
25
T
A
= 85°C TO 25°C
–20 0 30
680412 G10
10
5
0
–40 –30
–10
10 20
CHANGE IN GAIN ERROR (ppm)
–40
0
NUMBER OF PARTS
5
10
15
20
–20 0
20
40
680412 G11
25
30
T
A
= –45°C TO 25°C
–30 –10
10
30
INPUT FREQUENCY (Hz)
10
NOISE REJECTION (dB)
0
–50
–10
–30
–20
–40
–70
–60
680412 G12
1M1k 100k100 10k
FILTERED
2kHz
3kHz
ADC MODE:
NORMAL
15kHz
FAST
V
REG
(V)
4.5
MEASUREMENT ERROR (mV)
0
0.5
1.0
5.3 5.4
680412 G13
–0.5
–1.0
–2.0
4.7
4.9
5.1
4.6 5.5
4.8
5.0
5.2
–1.5
2.0
1.5
V
IN
= 2V
V
IN
= 3.3V
V
IN
= 4.2V
FREQUENCY (Hz)
100
PSRR (dB)
–60
–50
–40
1M
680412 G14
–70
–80
–65
–55
–45
–75
–85
–90
1k
10k
100k
10M
V
+
DC
= 39.6V
V
+
AC
= 5V
P-P
1 BIT CHANGE < –90dB
V
REG
GENERATED FROM
DRIVE PIN, FIGURE 28
FREQUENCY (Hz)
100
–20
–10
0
1M
68412 G15
–30
–40
1k 10k 100k 10M
–50
–60
–70
PSRR (dB)
V
REG(DC)
= 5V
V
REG(AC)
= 500mV
P-P
1 BIT CHANGE < –70dB
Cell Measurement Error
vs Input RC Values
GPIO Measurement Error
vs Input RC Values Top Cell Measurement Error vs V
+
INPUT RESISTOR, R (Ω)
1
CELL MEASUREMENT ERROR (mV)
0
5
10
10000
680412 G16
–5
–10
–20
10
100
1000
–15
20
NORMAL MODE CONVERSIONS
DIFFERENTIAL RC FILTER ON EVERY C PIN.
EXPECT CELL-TO-CELL AND
PART-TO-PART VARIATIONS
IN ERROR IF R > 100Ω AND/OR C > 10nF
15
C = 0
C = 10nF
C = 100nF
C = 1µF
INPUT RESISTANCE, R (Ω)
1
MEASUREMENT ERROR (mV)
2
6
10
10000
680412 G17
–2
–6
0
4
8
–4
–8
–10
10
100
1000
100000
C = 0
C = 100nF
C = 1µF
C = 10µF
TIME BETWEEN MEASUREMENTS > 3RC
V
+
(V)
36
–1.0
CELL 12 MEASUREMENT ERROR (mV)
–0.8
–0.4
–0.2
0
1.0
0.4
38
40
680412 G18
–0.6
0.6
0.8
0.2
42
44
C12-C11 = 3.3V
C12 = 39.6V