Datasheet

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
V
CC
= 2.7V
V
REF
= 2.5V
f
CLK
= 120kHz
f
SMPL
= f
SMPL(MAX)
Change in Offset vs Temperature
Reference Current vs
Sample Rate (LTC1285)
SAMPLE RATE (kHz)
0
0
REFERENCE CURRENT (µA)
5
15
20
25
50
35
2
4
5
LTC1285/88 • TPC04
10
40
45
30
13
6
7
8
T
A
= 25°C
V
CC
= 2.7V
V
REF
= 2.5V
f
CLK
= 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
T
A
= 25°C
V
CC
= 2.7V
f
CLK
= 120kHz
f
SMPL
= 7.5kHz
Change in Gain
vs Reference Voltage
Change in Offset
vs Reference Voltage
TEMPERATURE (°C)
–55
43
REFERENCE CURRENT (µA)
44
46
47
48
53
50
–15
25
45 125
LTC1285/88 • TPC05

45
51
52
49
–35 5
65
85
105
V
CC
= 2.7V
V
REF
= 2.5V
f
CLK
= 120kHz
f
SMPL
= 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
T
A
= 25°C
V
CC
= 2.7V
f
CLK
= 120kHz
f
SMPL
= 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
T
A
= 25°C
V
CC
= 2.7V
f
CLK
= 120kHz
f
SMPL
= 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
10 100
LTC1285/88 • TPC12
1
4
6
9
12
11
8
62
56
74
68
50
2
T
A
= 25°C
V
CC
= 2.7V
f
CLK
= 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
T
A
= 25°C
V
CC
= 2.7V
V
REF
= 2.5V
f
CLK
= 120kHz