for digitizing high frequency, wide dynamic range signals.
It is perfect for demanding communications applications
with AC performance that includes 84.1dB SNR and 99dB
spurious free dynamic range (SFDR).
DC specs include ±1LSB INL (typ), ±0.2LSB DNL (typ)
and no missing codes over temperature. The transition
noise is 1.44LSB
RMS
.
The digital outputs can be either full rate CMOS, double
data rate CMOS, or double data rate LVDS. A separate
output power supply allows the CMOS output swing to
range from 1.2V to 1.8V.
The ENC
+
and ENC
–
inputs may be driven differentially
or single-ended with a sine wave, PECL, LVDS, TTL, or
CMOS inputs. An optional clock duty cycle stabilizer al-
lows high performance at full speed for a wide range of
clock duty cycles.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
84.1dB SNR (46μV
RMS
Input Referred Noise)
99dB SFDR
±2.3LSB INL(Maximum)
Low Power: 88mW
Single 1.8V Supply
CMOS, DDR CMOS, or DDR LVDS Outputs
Selectable Input Ranges: 1V
P-P
to 2.1V
P-P
200MHz Full Power Bandwidth S/H
Shutdown and Nap Modes
Serial SPI Port for Configuration
Pin Compatible with
LTC2160:16-Bit, 25Msps, 45mW
48-Lead (7mm
×
7mm) QFN Package
APPLICATIONS
n
n
n
n
Low Power Instrumentation
Software Defined Radios
Portable Medical Imaging
Multichannel Data Acquisition
TYPICAL APPLICATION
1.8V
V
DD
1.8V
OV
DD
2.0
1.5
ANALOG
INPUT
16-BIT
ADC CORE
D15
OUTPUT
DRIVERS
D0
20MHz
CLOCK
CLOCK
CONTROL
CMOS
DDR CMOS OR
DDR LVDS
OUTPUTS
1.0
INL ERROR (LSB)
0.5
0.0
–0.5
–1.0
–1.5
–2.0
0
2269 TA01
Integral Non-Linearity (INL)
S/H
16384
32768
49152
OUTPUT CODE
65536
2269 TA02
GND
OGND
2269f
1
LTC2269
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltages (V
DD
, O
VDD
) ....................... –0.3V to 2V
Analog Input Voltage (A
IN+
, A
IN –
, PAR/SER, SENSE)
(Note 3) ................................... –0.3V to (V
DD
+ 0.2V)
Digital Input Voltage (ENC
+
, ENC
–
,
CS,
SDI, SCK)
(Note 4) ................................................ –0.3V to 3.9V
SDO (Note 4)............................................. –0.3V to 3.9V
Digital Output Voltage ................–0.3V to (OV
DD
+ 0.3V)
Operating Temperature Range
LTC2269C ................................................ 0°C to 70°C
LTC2269I .............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
PIN CONFIGURATION
FULL RATE CMOS OUTPUT MODE
TOP VIEW
48 V
DD
47 V
DD
46 SENSE
45 V
REF
44 SDO
43 GND
42 OF
41 DNC
40 D15
39 D14
38 D13
37 D12
DOUBLE DATA RATE CMOS OUTPUT MODE
TOP VIEW
48 V
DD
47 V
DD
46 SENSE
45 V
REF
44 SDO
43 GND
42 OF
41 DNC
40 D14_15
39 DNC
38 D12_13
37 DNC
36 D11
35 D10
34 D9
33 D8
32 OV
DD
31 OGND
30 CLKOUT
+
29 CLKOUT
–
28 D7
27 D6
26 D5
25 D4
V
CM
1
A
IN +
2
A
IN –
3
GND 4
REFH 5
REFL 6
REFH 7
REFL 8
PAR/SER 9
GND 10
GND 11
V
DD
12
49
GND
36 D10_11
35 DNC
34 D8_9
33 DNC
32 OV
DD
31 OGND
30 CLKOUT
+
29 CLKOUT
–
28 D6_7
27 DNC
26 D4_5
25 DNC
UK PACKAGE
48-LEAD (7mm 7mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 29°C/W
EXPOSED PAD (PIN 49) IS GND, MUST BE SOLDERED TO PCB
V
DD
13
GND 14
ENC
+
15
ENC
–
16
CS
17
SCK 18
SDI 19
GND 20
DNC 21
D0_1 22
DNC 23
D2_3 24
V
CM
1
A
IN +
2
A
IN –
3
GND 4
REFH 5
REFL 6
REFH 7
REFL 8
PAR/SER 9
GND 10
GND 11
V
DD
12
49
GND
UK PACKAGE
48-LEAD (7mm 7mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 29°C/W
EXPOSED PAD (PIN 49) IS GND, MUST BE SOLDERED TO PCB
V
DD
13
GND 14
ENC
+
15
ENC
–
16
CS
17
SCK 18
SDI 19
GND 20
D0 21
D1 22
D2 23
D3 24
2269f
2
LTC2269
PIN CONFIGURATION
DOUBLE DATA RATE LVDS OUTPUT MODE
TOP VIEW
48 V
DD
47 V
DD
46 SENSE
45 V
REF
44 SDO
43 GND
42 OF
+
41 OF
–
40 D14_15
+
39 D14_15
–
38 D12_13
+
37 D12_13
–
V
CM
1
A
IN +
2
A
IN –
3
GND 4
REFH 5
REFL 6
REFH 7
REFL 8
PAR/SER 9
GND 10
GND 11
V
DD
12
49
GND
36 D10_11
+
35 D10_11
–
34 D8_9
+
33 D8_9
–
32 OV
DD
31 OGND
30 CLKOUT
+
29 CLKOUT
–
28 D6_7
+
27 D6_7–
26 D4_5
+
25 D4_5–
UK PACKAGE
48-LEAD (7mm 7mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 29°C/W
EXPOSED PAD (PIN 49) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC2269CUK#PBF
LTC2269IUK#PBF
TAPE AND REEL
LTC2269CUK#TRPBF
LTC2269IUK#TRPBF
PART MARKING*
LTC2269UK
LTC2269UK
PACKAGE DESCRIPTION
48-Lead (7mm
×
7mm) Plastic QFN
48-Lead (7mm
×
7mm) Plastic QFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
V
DD
13
GND 14
ENC
+
15
ENC
–
16
CS
17
SCK 18
SDI 19
GND 20
D0_1
–
21
D0_1
+
22
D2_3
–
23
D2_3
+
24
2269f
3
LTC2269
CONVERTER CHARACTERISTICS
PARAMETER
Resolution (No Missing Codes)
Integral Linearity Error
Differential Linearity Error
Offset Error
Gain Error
Offset Drift
Full-Scale Drift
Transition Noise
Internal Reference
External Reference
External Reference
Differential Analog Input
(Note 6)
Differential Analog Input
(Note 7)
Internal Reference
External Reference
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
CONDITIONS
l
l
l
l
l
MIN
16
–2.3
–0.8
–7
–1.5
TYP
±1
±0.2
±1.3
±1.2
–0.2
±10
±30
±10
1.44
MAX
2.3
0.8
7
1.1
UNITS
Bits
LSB
LSB
mV
%FS
%FS
μV/°C
ppm/°C
ppm/°C
LSB
RMS
ANALOG INPUT
The
l
denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 5)
PARAMETER
Analog Input Range (A
IN+
– A
IN–
)
Analog Input Common Mode (A
IN+
+ A
IN–
)/2
External Voltage Reference Applied to SENSE
Analog Input Common Mode Current
Analog Input Leakage Current (No Encode)
PAR/SER Input Leakage Current
SENSE Input Leakage Current
Sample-and-Hold Acquisition Delay Time
Sample-and-Hold Acquisition Delay Jitter
Analog Input Common Mode Rejection Ratio
Full Power Bandwidth
Figure 5 Test Circuit
Single-Ended Encode
Differential Encode
SYMBOL
V
IN
V
IN(CM)
V
SENSE
I
INCM
I
IN1
I
IN2
I
IN3
t
AP
t
JITTER
CMRR
BW-3B
CONDITIONS
1.7V < V
DD
< 1.9V
Differential Analog Input (Note 8)
External Reference Mode
Per Pin, 20Msps
0 < A
IN+
, A
IN–
< V
DD
0 < PAR/SER < V
DD
0.625 < SENSE < 1.3V
l
l
l
l
l
l
MIN
0.65
0.625
–1
–1
–2
TYP
1 to 2.1
V
CM
1.250
32
MAX
V
CM
+ 200mV
1.300
1
1
2
UNITS
V
P-P
V
V
μA
μA
μA
μA
ns
fs
RMS
fs
RMS
dB
MHz
0
85
100
80
200
DYNAMIC ACCURACY
SYMBOL PARAMETER
SNR
Signal-to-Noise Ratio
The
l
denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C. A
IN
= –1dBFS. (Note 5)
CONDITIONS
1.4MHz Input
5MHz Input
30MHz Input
70MHz Input
1.4MHz Input
5MHz Input
30MHz Input
70MHz Input
l
MIN
82.1
TYP
84.1
84.1
83.8
82.7
99
98
98
90
MAX
UNITS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
SFDR
Spurious Free Dynamic Range
2nd Harmonic
l
90
2269f
4
LTC2269
DYNAMIC ACCURACY
SYMBOL PARAMETER
SFDR
Spurious Free Dynamic Range
3rd Harmonic
The
l
denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C. A
IN
= –1dBFS. (Note 5)
CONDITIONS
1.4MHz Input
5MHz Input
30MHz Input
70MHz Input
1.4MHz Input
5MHz Input
30MHz Input
70MHz Input
1.4MHz Input
5MHz Input
30MHz Input
70MHz Input
l
MIN
92
TYP
99
98
98
96
110
110
105
100
83.9
83.9
83.7
82
MAX
UNITS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
SFDR
Spurious Free Dynamic Range
4th Harmonic or Higher
l
95
S/(N+D) Signal-to-Noise Plus Distortion Ratio
l
81.7
INTERNAL REFERENCE CHARACTERISTICS
PARAMETER
V
CM
Output Voltage
V
CM
Output Temperature Drift
V
CM
Output Resistance
V
REF
Output Voltage
V
REF
Output Temperature Drift
V
REF
Output Resistance
V
REF
Line Regulation
–400μA < I
OUT
< 1mA
1.7V < V
DD
< 1.9V
–600μA < I
OUT
< 1mA
I
OUT
= 0
CONDITIONS
I
OUT
= 0
The
l
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
MIN
l
0.5•V
DD
– 25mV
TYP
0.5•V
DD
±25
4
MAX
0.5•V
DD
+ 25mV
UNITS
V
ppm/°C
Ω
l
1.230
1.250
±25
7
0.6
1.270
V
ppm/°C
Ω
mV/V
DIGITAL INPUTS AND OUTPUTS
SYMBOL
PARAMETER
ENCODE INPUTS (ENC
+
, ENC
–
)
DIFFERENTIAL ENCODE MODE (ENC
–
NOT TIED TO GND)
V
ID
V
ICM
V
IN
R
IN
C
IN
V
IH
V
IL
V
IN
R
IN
C
IN
Differential Input Voltage
Common Mode Input Voltage
Input Voltage Range
Input Resistance
Input Capacitance
High Level Input Voltage
Low Level Input Voltage
Input Voltage Range
Input Resistance
Input Capacitance
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
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