Datasheet

TLC1514, TLC1518
5-V, 10-BIT, 400 KSPS, 4/8 CHANNEL, LOW POWER,
SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN
SLAS252 – DECEMBER 1999
22
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
reference specifications (0.1 µF and 10 µF between REFP and REFM pins)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Reference input voltage, REFP V
CC
= 4.5 V V
CC
V
In
p
ut im
p
edance
V
CC
=55V
CS = 1, SCLK = 0, (off) 100 M
Inp
u
t
impedance
V
CC
=
5
.
5
V
CS = 0, SCLK = 20 MHz (on) 20 25 k
Input voltage difference, REFP – REFM V
CC
= 4.5 V 2 V
CC
V
Internal reference voltage,REFP – REFM V
CC
= 5.5 V Reference select = internal 3.85 4 4.15 V
Internal reference start up time V
CC
= 5.5 V 10 µF 20 ms
Reference temperature coefficient V
CC
= 4.5 V 16 40 PPM/°C
operating characteristics over recommended operating free-air temperature range, V
CC
= V
REFP
= 4.5 V,
SCLK frequency = 20 MHz (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP
MAX UNIT
Integral linearity error (INL) (see Note 4) ±0.5 LSB
Differential linearity error (DNL) See Note 3 ±0.5 LSB
E
O
Offset error (see Note 5) See Note 3 ±1 LSB
E
G
Gain error (see Note 5) See Note 3 ±0.5 ±1 LSB
E
T
Total unadjusted error (see Note 6) ±1 LSB
SDI = B000h
200h
(512D)
Self-test output code (see Table 1 and Note 7)
SDI = C000h
000h
(0D)
SDI = D000h
3FFh
(1023D)
t
conv
Conversion time External SCLK
(14XDIV)
f
SCLK
t
sample
Sampling time At 1 k 600 ns
t
t(I/O)
Transition time for EOC, INT 50 ns
t
t(CLK)
Transition time for SDI, SDO 25 ns
All typical values are at T
A
= 25°C.
NOTES: 3. Analog input voltages greater than that applied to REFP convert as all ones (1111111111), while input voltages less than that applied
to REFM convert as all zeros (0000000000). The device is functional with reference down to 2 V (VREFP – VREFM); however, the
electrical specifications are no longer applicable.
4. Linear error is the maximum deviation from the best straight line through the A/D transfer characteristics.
5. Zero error is the difference between 0000000000 and the converted output for zero input voltage: full-scale error is the difference
between 1111111111 and the converted output for full-scale input voltage.
6. Total unadjusted error comprises linearity, zero, and full-scale errors.
7. Both the input data and the output codes are expressed in positive logic.