Datasheet

3
LTC1666/LTC1667/LTC1668
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
DD
= 5V, V
SS
= –5V, LADCOM = AGND = DGND = 0V, I
OUTFS
= 10mA.
ELECTRICAL CHARACTERISTICS
LTC1666 LTC1667 LTC1668
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
DC Accuracy (Measured at I
OUT A
, Driving a Virtual Ground)
Resolution ● 12 14 16 Bits
Monotonicity 12 14 14 Bits
INL Integral Nonlinearity (Note 2) ±1 ±2 ±8 LSB
DNL Differential Nonlinearity (Note 2) ±1 ±1 ±1 ±4 LSB
Offset Error 0.1 ±0.2 0.1 ±0.2 0.1 ±0.2 % FSR
Offset Error Drift 5 5 5 ppm/°C
GE Gain Error Internal Reference, R
IREFIN
= 2k 2 2 2 % FSR
External Reference, 1 1 1 % FSR
V
REF
= 2.5V, R
IREFIN
= 2k
Gain Error Drift Internal Reference 50 50 50 ppm/°C
External Reference 30 30 30 ppm/°C
PSRR Power Supply V
DD
= 5V ±5% ±0.1 ±0.1 ±0.1 % FSR/V
Rejection Ratio V
SS
= –5V ±5% ±0.2 ±0.2 ±0.2 % FSR/V
AC Linearity
SFDR Spurious Free Dynamic f
CLK
= 25Msps, f
OUT
= 1MHz
Range to Nyquist 0dB FS Output 76 78 78 87 dB
–6dB FS Output 87 dB
–12dB FS Output 83 dB
f
CLK
= 50Msps, f
OUT
= 1MHz 85 dB
f
CLK
= 50Msps, f
OUT
= 2.5MHz 81 dB
f
CLK
= 50Msps, f
OUT
= 5MHz 79 dB
f
CLK
= 50Msps, f
OUT
= 20MHz 70 dB
Spurious Free Dynamic f
CLK
= 25Msps, 85 86 86 96 dB
Range Within a Window f
OUT
= 1MHz, 2MHz Span
f
CLK
= 50Msps, 88 dB
f
OUT
= 5MHz, 4MHz Span
THD Total Harmonic Distortion f
CLK
= 25Msps, f
OUT
= 1MHz –75 –77 –84 –77 dB
f
CLK
= 50Msps, f
OUT
= 5MHz –78 dB