
5
LTC1285/LTC1288
TEMPERATURE (°C)
0
CHANGE
IN
OFFSET
(LSB)
0.15
30
LTC1285/88 TPC07
0
– 0.10
10
20
40
– 0.15
– 0.20
0.20
0.10
0.05
– 0.05
50
60
70
VCC = 2.7V
VREF = 2.5V
fCLK = 120kHz
fSMPL = fSMPL(MAX)
Change in Offset vs Temperature
Reference Current vs
Sample Rate (LTC1285)
SAMPLE RATE (kHz)
0
REFERENCE
CURRENT
(
A)
5
15
20
25
50
35
2
4
5
LTC1285/88 TPC04
10
40
45
30
13
6
7
8
TA = 25°C
VCC = 2.7V
VREF = 2.5V
fCLK = 120kHz
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
REFERENCE VOLTAGE (V)
1.0
0
CHANGE
IN
GAIN
(LSB)
–1
–3
–4
–5
–10
–7
1.4
1.8 2.0
2.8
LTC1285/88 TPC09
–2
–8
–9
–6
1.2
1.6
2.2 2.4 2.6
TA = 25°C
VCC = 2.7V
fCLK = 120kHz
fSMPL = 7.5kHz
Change in Gain
vs Reference Voltage
Change in Offset
vs Reference Voltage
TEMPERATURE (°C)
–55
43
REFERENCE
CURRENT
(
A)
44
46
47
48
53
50
–15
25
45
125
LTC1285/88 TPC05
45
51
52
49
–35
5
65
85 105
VCC = 2.7V
VREF = 2.5V
fCLK = 120kHz
fSMPL = 7.5kHz
Reference Current vs Temperature
Change in Linearity
vs Reference Voltage
REFERENCE VOLTAGE (V)
1.0
0
CHANGE
IN
LINEARITY
(LSB)
0.05
0.15
0.20
0.25
0.50
0.35
1.4
1.8 2.0
2.8
LTC1285/88 TPC08
0.10
0.40
0.45
0.30
1.2
1.6
2.2 2.4 2.6
TA = 25°C
VCC = 2.7V
fCLK = 120kHz
fSMPL = 7.5kHz
REFERENCE VOLTAGE (V)
0.5
0
CHANGE
IN
OFFSET
(LSB
=
1/4096
×
V
REF
)
0.5
1.0
1.5
2.0
2.5
3.0
1.0
1.5
2.0
2.5
LTC1285/88 TPC06
3.0
TA = 25°C
VCC = 2.7V
fCLK = 120kHz
fSMPL = 7.5kHz
Effective Bits and S/(N + D)
vs Input Frequency
INPUT FREQUENCY (kHz)
1
0
EFFECTIVE
NUMBER
OF
BITS
(ENOBs)
S/(N
+
D)
(dB)
3
5
7
10
100
LTC1285/88 TPC12
1
4
6
9
12
11
8
62
56
74
68
50
2
TA = 25°C
VCC = 2.7V
fCLK = 120kHz
Differential Nonlinearity vs Code
CODE
0
–1
DIFFERENTIAL
NONLINEARITY
ERROR
(LSB)
– 0.5
0
0.5
1
512 1024 1536 2048
LTC1285/88 TPC11
2560 3072 3584 4096
TA = 25°C
VCC = 2.7V
VREF = 2.5V
fCLK = 120kHz