Datasheet

LTC2228/LTC2227/LTC2226
4
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DYNAMIC ACCURACY
The l denotes the specifi cations which apply over the full operating temperature range,
otherwise specifi cations are at T
A
= 25°C. A
IN
= –1dBFS. (Note 4)
SYMBOL PARAMETER CONDITIONS
LTC2228 LTC2227 LTC2226
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
SFDR Spurious Free
Dynamic Range
4th Harmonic
or Higher
5MHz Input 95 95 95 dB
12.5MHz Input
l
82 95 dB
20MHz Input
l
82 95 dB
30MHz Input
l
82 95 dB
70MHz Input 95 95 95 dB
140MHz Input 90 90 90 dB
S/(N+D) Signal-to-Noise
Plus Distortion
Ratio
5MHz Input 71.3 71.4 71.4 dB
12.5MHz Input
l
69.8 71.2 dB
20MHz Input
l
69.7 71.2 dB
30MHz Input
l
69.6 71.2 dB
70MHz Input 71.1 70.9 70.8 dB
140MHz Input 69.9 69.9 69.8 dB
IMD Intermodulation
Distortion
f
IN1
= 28.2MHz,
f
IN2
= 26.8MHz
90 90 90 dB
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CM
Output Voltage I
OUT
= 0 1.475 1.500 1.525 V
V
CM
Output Tempco ±25 ppm/°C
V
CM
Line Regulation 2.7V < V
DD
< 3.4V 3 mV/V
V
CM
Output Resistance –1mA < I
OUT
< 1mA 4 Ω
INTERNAL REFERENCE CHARACTERISTICS
(Note 4)
DIGITAL INPUTS AND DIGITAL OUTPUTS
The l denotes the specifi cations which apply over the full
operating temperature range, otherwise specifi cations are at T
A
= 25°C. (Note 4)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
LOGIC INPUTS (CLK, OE, SHDN)
V
IH
High Level Input Voltage V
DD
= 3V
l
2V
V
IL
Low Level Input Voltage V
DD
= 3V
l
0.8 V
I
IN
Input Current V
IN
= 0V to V
DD
l
–10 10 μA
C
IN
Input Capacitance (Note 7) 3 pF
LOGIC OUTPUTS
OV
DD
= 3V
C
OZ
Hi-Z Output Capacitance OE = High (Note 7) 3 pF
I
SOURCE
Output Source Current V
OUT
= 0V 50 mA
I
SINK
Output Sink Current V
OUT
= 3V 50 mA
V
OH
High Level Output Voltage I
O
= –10μA
I
O
= –200μA
l
2.7
2.995
2.99
V
V
V
OL
Low Level Output Voltage I
O
= 10μA
I
O
= 1.6mA
l
0.005
0.09 0.4
V
V
OV
DD
= 2.5V
V
OH
High Level Output Voltage I
O
= –200μA 2.49 V
V
OL
Low Level Output Voltage I
O
= 1.6mA 0.09 V
OV
DD
= 1.8V
V
OH
High Level Output Voltage I
O
= –200μA 1.79 V
V
OL
Low Level Output Voltage I
O
= 1.6mA 0.09 V