for digitizing high frequency, wide dynamic range signals.
It is perfect for demanding communications applications
with AC performance that includes 77dB SNR and 90dB
spurious free dynamic range (SFDR). Ultralow jitter of
0.07ps
RMS
allows undersampling of IF frequencies with
excellent noise performance.
DC specs include ±2LSB INL (typ), ±0.5LSB DNL (typ)
and no missing codes over temperature. The transition
noise is 3.2LSB
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.
77dB SNR
90dB SFDR
Low Power: 43mW
Single 1.8V Supply
CMOS, DDR CMOS, or DDR LVDS Outputs
Selectable Input Ranges: 1V
P-P
to 2V
P-P
550MHz Full Power Bandwidth S/H
Optional Data Output Randomizer
Optional Clock Duty Cycle Stabilizer
Shutdown and Nap Modes
Serial SPI Port for Configuration
48-Lead (7mm
×
7mm) QFN Package
applicaTions
n
n
n
n
n
n
Communications
Cellular Base Stations
Software Defined Radios
Portable Medical Imaging
Multichannel Data Acquisition
Nondestructive Testing
Typical applicaTion
1.8V
V
DD
1.8V
OV
DD
4.0
3.0
ANALOG
INPUT
S/H
16-BIT
ADC CORE
OUTPUT
DRIVERS
20MHz
CLOCK
2.0
INL ERROR (LSB)
D15
•
•
•
D0
1.0
0
–1.0
–2.0
–3.0
–4.0
2159 TA01a
Integral Non-Linearity (INL)
CMOS
DDR CMOS OR
DDR LVDS
OUTPUTS
CLOCK
CONTROL
0
16384
GND
OGND
32768
49152
OUTPUT CODE
65536
2159 TA01b
2159f
1
LTC2159
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
LTC2159C ................................................ 0°C to 70°C
LTC2159I .............................................–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
2159f
2
LTC2159
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
LTC2159CUK#PBF
LTC2159IUK#PBF
TAPE AND REEL
LTC2159CUK#TRPBF
LTC2159IUK#TRPBF
PART MARKING*
LTC2159UK
LTC2159UK
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
2159f
3
LTC2159
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
CONDITIONS
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
MIN
16
–6
–0.9
–7
–1.8
±2
±0.5
±1.5
±1.5
–0.5
±10
±30
±10
3.2
6
0.9
7
0.8
TYP
MAX
UNITS
Bits
LSB
LSB
mV
%FS
%FS
µV/°C
ppm/°C
ppm/°C
LSB
RMS
analog inpuT
SYMBOL
V
IN
V
IN(CM)
V
SENSE
I
INCM
I
IN1
I
IN2
I
IN3
t
AP
t
JITTER
CMRR
BW-3B
PARAMETER
The
l
denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 5)
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
Single-Ended Encode
Differential Encode
Figure 6 Test Circuit
l
l
l
l
l
l
MIN
0.7
0.625
–1
–3
–3
TYP
1 to 2
V
CM
1.250
32
MAX
1.25
1.300
1
3
3
UNITS
V
P-P
V
V
µA
µA
µA
µA
ns
ps
RMS
dB
MHz
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
0
0.07
0.09
80
550
DynaMic accuracy
SYMBOL
SNR
PARAMETER
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
5MHz Input
30MHz Input
70MHz Input
140MHz Input
5MHz Input
30MHz Input
70MHz Input
140MHz Input
5MHz Input
30MHz Input
70MHz Input
140MHz Input
l
MIN
75.5
TYP
77.1
77.0
76.9
76.4
90
90
89
84
90
90
89
84
MAX
UNITS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
SFDR
Spurious Free Dynamic Range
2nd Harmonic
l
84
SFDR
Spurious Free Dynamic Range
3rd Harmonic
l
84
2159f
4
LTC2159
DynaMic accuracy
SYMBOL
SFDR
PARAMETER
Spurious Free Dynamic Range
4th Harmonic or Higher
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
5MHz Input
30MHz Input
70MHz Input
140MHz Input
5MHz Input
30MHz Input
70MHz Input
140MHz Input
l
MIN
89
TYP
95
95
95
95
76.9
76.8
76.5
76.4
MAX
UNITS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
S/(N+D)
Signal-to-Noise Plus Distortion Ratio
l
74.9
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
0.5•V
DD
– 25mV
TYP
0.5•V
DD
±25
4
1.225
1.250
±25
7
0.6
1.275
MAX
0.5•V
DD
+ 25mV
UNITS
V
ppm/°C
Ω
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
V
IH
V
IL
I
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
High Level Input Voltage
Low Level Input Voltage
Input Current
Input Capacitance
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
CONDITIONS
MIN
TYP
MAX
UNITS
(Note 8)
Internally Set
Externally Set (Note 8)
ENC
+
, ENC
–
to GND
(See Figure 10)
(Note 8)
V
DD
= 1.8V
V
DD
= 1.8V
ENC
+
to GND
(See Figure 11)
(Note 8)
V
DD
= 1.8V
V
DD
= 1.8V
V
IN
= 0V to 3.6V
(Note 8)
l
l
l
0.2
1.1
0.2
10
3.5
1.2
1.6
3.6
V
V
V
V
kΩ
pF
V
0.6
V
V
kΩ
pF
V
0.6
V
µA
pF
2159f
SINGLE-ENDED ENCODE MODE (ENC
–
TIED TO GND)
l
l
l
1.2
0
30
3.5
3.6
DIGITAL INPUTS (CS, SDI, SCK in Serial or Parallel Programming Mode. SDO in Parallel Programming Mode)
