LINEAR TECHNOLOGY LTC2222, 2223 User Manual
FEATURES
■
Sample Rate: 105Msps/80Msps
■
68dB SNR up to 140MHz Input
■
80dB SFDR up to 170MHz Input
■
775MHz Full Power Bandwidth S/H
■
Single 3.3V Supply
■
Low Power Dissipation: 475mW/366mW
■
Selectable Input Ranges: ±0.5V or ±1V
■
No Missing Codes
■
Optional Clock Duty Cycle Stabilizer
■
Shutdown and Nap Modes
■
Data Ready Output Clock
■
Pin Compatible Family
135Msps: LTC2224 (12-Bit), LTC2234 (10-Bit)
105Msps: LTC2222 (12-Bit), LTC2232 (10-Bit)
80Msps: LTC2223 (12-Bit), LTC2233 (10-Bit)
■
48-Pin QFN Package
U
APPLICATIO S
■
Wireless and Wired Broadband Communication
■
Cable Head-End Systems
■
Power Amplifier Linearization
■
Communications Test Equipment
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC2222/LTC2223
12-Bit,105Msps/
80Msps ADCs
U
DESCRIPTIO
The LTC®2222 and LTC2223 are 105Msps/80Msps, sampling 12-bit A/D converters designed for digitizing high
frequency, wide dynamic range signals. The LTC2222/
LTC2223 are perfect for demanding communications
applications with AC performance that includes 68dB SNR
and 80dB spurious free dynamic range for signals
up to 170MHz. Ultralow jitter of 0.15ps
undersampling of IF frequencies with excellent noise
performance.
DC specs include ±0.3LSB INL (typ), ±0.2LSB DNL (typ)
and no missing codes over temperature. The transition
noise is a low 0.5LSB
RMS
.
A separate output power supply allows the outputs to drive
0.5V to 3.3V logic.
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 allows high
performance at full speed for a wide range of clock duty
cycles.
RMS
allows
TYPICAL APPLICATIO
REFH
REFL
ANALOG
INPUT
FLEXIBLE
REFERENCE
+
INPUT
S/H
–
CLOCK/DUTY
CYCLE
CONTROL
ENCODE
INPUT
12-BIT
PIPELINED
ADC CORE
U
V
3.3V
DD
CORRECTION
LOGIC
OUTPUT
DRIVERS
22201 TA01
0V
DD
0.5V TO 3.3V
D11
•
•
•
D0
0GND
100
95
90
85
80
SFDR (dBFS)
75
70
65
60
0
SFDR vs Input Frequency
4th OR HIGHER
2nd or 3rd
200 300 400 500 600
100
INPUT FREQUENCY (MHz)
22223 TA01b
22223f
1
LTC2222/LTC2223
WW
W
U
ABSOLUTE AXI U RATI GS
OV
= VDD (Notes 1, 2)
DD
Supply Voltage (VDD) ................................................. 4V
Digital Output Ground Voltage (OGND) ....... –0.3V to 1V
Analog Input Voltage (Note 3) ..... –0.3V to (V
Digital Input Voltage .................... –0.3V to (V
Digital Output Voltage ............... –0.3V to (OV
Power Dissipation............................................ 1500mW
Operating Temperature Range
LTC2222C, LTC2223C ............................. 0°C to 70°C
LTC2222I, LTC2223I ...........................–40°C to 85°C
Storage Temperature Range ..................–65°C to 125°C
+ 0.3V)
DD
+ 0.3V)
DD
+ 0.3V)
DD
UUW
PACKAGE/ORDER I FOR ATIO
TOP VIEW
DD
48 GND
47 VDD46 VDD45 GND
44 VCM43 SENSE
42 MODE
41 OF
40 D11
39 D10
38 OGND
37 OV
23
OV
DD
D1 24
36 D9
35 D8
34 D7
33 OV
DD
32 OGND
31 D6
30 D5
29 D4
28 OV
DD
27 OGND
26 D3
25 D2
A
IN+
–
A
IN
REFHA 3
REFHA 4
REFLB
REFLB
REFHB 7
REFHB 8
REFLA 9
REFLA 10
V
11
DD
V
12
DD
1
2
5
6
14
DD
V
GND 13
48-LEAD (7mm × 7mm) PLASTIC QFN
EXPOSED PAD IS GND (PIN 49),
MUST BE SOLDERED TO PCB
T
JMAX
49
18
16
19
17
+
–
GND 15
OE
ENC
ENC
SHDN
UK PACKAGE
= 125°C, θJA = 29°C/W
20
CLOCKOUT
DO 21
OGND 22
ORDER PART
NUMBER
LTC2222CUK
LTC2223CUK
LTC2222IUK
LTC2223IUK
*The temperature grade is identified by a label on the shipping container. Consult LTC
Marketing for parts specified with wider operating temperature ranges.
UK PART
MARKING*
LTC2222UK
LTC2223UK
LTC2222UK
LTC2223UK
U
CO VERTER CHARACTERISTICS
temperature range, otherwise specifications are at TA = 25°C. (Note 4)
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Resolution (No Missing Codes) ● 12 12 Bits
Integral Linearity Error (Note 5) Differential Analog Input ● –1.3 ±0.3 1.3 –1.1 ±0.3 1.1 LSB
Differential Linearity Error Differential Analog Input ● –1 ±0.2 1 –0.8 ±0.2 0.8 LSB
Integral Linearity Error (Note 5) Single-Ended Analog Input ±1 ±1 LSB
Differential Linearity Error Single-Ended Analog Input ±0.2 ±0.2 LSB
Offset Error (Note 6) ● –30 ±330–30±330 mV
Gain Error External Reference ● –2.5 ±0.5 2.5 –2.5 ±0.5 2.5 %FS
Offset Drift ±10 ±10 µV/C
Full-Scale Drift Internal Reference ±30 ±30 ppm/C
External Reference ±15 ±15 ppm/C
Transition Noise SENSE = 1V 0.5 0.5 LSB
The ● denotes the specifications which apply over the full operating
LTC2222 LTC2223
RMS
22223f
2
LTC2222/LTC2223
UU
A ALOG I PUT
specifications are at TA = 25°C. (Note 4)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
V
IN, CM
I
IN
I
SENSE
I
MODE
t
AP
t
JITTER
CMRR Analog Input Common Mode Rejection Ratio 80 dB
U
Analog Input Range (A
Analog Input Common Mode Differential Input ● 1 1.6 1.9 V
Analog Input Leakage Current 0 < A
SENSE Input Leakage 0V < SENSE < 1V ● –1 1 µA
MODE Pin Pull-Down Current to GND 10 µA
Full Power Bandwidth Figure 8 Test Circuit 775 MHz
Sample and Hold Acquisition Delay Time 0 ns
Sample and Hold Acquisition Delay Time Jitter 0.15 ps
W
DY A IC ACCURACY
otherwise specifications are at TA = 25°C. A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
SNR Signal-to-Noise Ratio 30MHz Input (1V Range) 63.5 63.6 dB
SFDR Spurious Free Dynamic Range 30MHz Input (1V Range) 84 84 dB
SFDR Spurious Free Dynamic Range 30MHz Input (1V Range) 90 90 dB
4th Harmonic or Higher 30MHz Input (2V Range) 90 90 dB
S/(N+D) Signal-to-Noise 30MHz Input (1V Range) 63.5 63.6 dB
Plus Distortion Ratio 30MHz Input (2V Range)
IMD Intermodulation Distortion f
The ● denotes the specifications which apply over the full operating temperature range, otherwise
+
–
– A
IN
) 3.1V < VDD < 3.5V ● ±0.5 to ±1V
IN
+
–
, A
< V
IN
IN
DD
● –1 1 µA
RMS
The ● denotes the specifications which apply over the full operating temperature range,
= –1dBFS. (Note 4)
IN
LTC2222 LTC2223
30MHz Input (2V Range)
70MHz Input (1V Range) 63.4 63.5 dB
70MHz Input (2V Range) 68.3 68.4 dB
140MHz Input (1V Range) 63.2 63.5 dB
140MHz Input (2V Range) 67.9 68.0 dB
250MHz Input (1V Range) 62.7 63.0 dB
250MHz Input (2V Range) 67.0 67.3 dB
30MHz Input (2V Range)
70MHz Input (1V Range) 84 84 dB
70MHz Input (2V Range) 84 84 dB
140MHz Input (1V Range) 81 84 dB
140MHz Input (2V Range) 81 81 dB
250MHz Input (1V Range) 77 80 dB
250MHz Input (2V Range) 77 75 dB
70MHz Input (1V Range) 90 90 dB
70MHz Input (2V Range) 90 90 dB
140MHz Input (1V Range) 90 90 dB
140MHz Input (2V Range) 90 90 dB
250MHz Input (1V Range) 90 90 dB
250MHz Input (2V Range) 90 90 dB
70MHz Input (1V Range) 63.5 63.6 dB
70MHz Input (2V Range) 68.2 68.3 dB
= 138MHz, f
IN1
= 140MHz 81 81 dBc
IN2
● 67 68.4 67.5 68.5 dB
● 72 84 73 84 dB
● 66.5 68.4 67 68.5 dB
22223f
3
LTC2222/LTC2223
UU U
I TER AL REFERE CE CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
VCM Output Voltage I
VCM Output Tempco ±25 ppm/C
VCM Line Regulation 3.1V < VDD < 3.5V 3 mV/V
V
Output Resistance –1mA < I
CM
= 0 1.575 1.600 1.625 V
OUT
< 1mA 4 Ω
OUT
(Note 4)
UU
DIGITAL I PUTS A D DIGITAL OUTPUTS
full operating temperature range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ENCODE INPUTS (ENC+, ENC–)
V
ID
V
ICM
R
IN
C
IN
LOGIC INPUTS (OE, SHDN)
V
IH
V
IL
I
IN
C
IN
LOGIC OUTPUTS
OVDD = 3.3V
C
OZ
I
SOURCE
I
SINK
V
OH
V
OL
OVDD = 2.5V
V
OH
V
OL
OV
= 1.8V
DD
V
OH
V
OL
Differential Input Voltage ● 0.2 V
Common Mode Input Voltage Internally Set 1.6 V
Externally Set (Note 7)
Input Resistance 6kΩ
Input Capacitance (Note 7) 3 pF
High Level Input Voltage VDD = 3.3V ● 2V
Low Level Input Voltage VDD = 3.3V ● 0.8 V
Input Current VIN = 0V to V
Input Capacitance (Note 7) 3 pF
Hi-Z Output Capacitance OE = High (Note 7) 3 pF
Output Source Current V
Output Sink Current V
High Level Output Voltage IO = –10µA 3.295 V
Low Level Output Voltage IO = 10µA 0.005 V
High Level Output Voltage IO = –200µA 2.49 V
Low Level Output Voltage IO = 1.6mA 0.09 V
High Level Output Voltage IO = –200µA 1.79 V
Low Level Output Voltage IO = 1.6mA 0.09 V
OUT
OUT
= –200µA ● 3.1 3.29 V
I
O
= 1.6mA ● 0.09 0.4 V
I
O
DD
= 0V 50 mA
= 3.3V 50 mA
The ● denotes the specifications which apply over the
● 1.1 1.6 2.5 V
● –10 10 µA
4
22223f
LTC2222/LTC2223
WU
POWER REQUIRE E TS
range, otherwise specifications are at T
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
V
DD
OV
IV
P
DISS
P
SHDN
P
NAP
DD
DD
Analog Supply Voltage (Note 7) ● 3.1 3.3 3.5 3.1 3.3 3.5 V
Output Supply Voltage (Note 7) ● 0.5 3.3 3.6 0.5 3.3 3.6 V
Analog Supply Current ● 144 162 111 123 mA
Power Dissipation ● 475 535 366 406 mW
Shutdown Power SHDN = H, OE = H, No CLK 2 2 mW
Nap Mode Power SHDN = H, OE = L, No CLK 35 35 mW
= 25°C. (Note 8)
A
The ● denotes the specifications which apply over the full operating temperature
LTC2222 LTC2223
UW
TI I G CHARACTERISTICS
range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
f
S
t
L
t
H
t
AP
t
D
t
C
t
OE
Pipeline Latency 5 5 Cycles
Sampling Frequency ● 1 105 1 80 MHz
ENC Low Time Duty Cycle Stabilizer Off ● 4.5 4.76 500 5.9 6.25 500 ns
ENC High Time Duty Cycle Stabilizer Off ● 4.5 4.76 500 5.9 6.25 500 ns
Sample-and-Hold Aperture Delay 0 0 ns
ENC to DATA Delay (Note 7) ● 1.3 2.1 4 1.3 2.1 4 ns
ENC to CLOCKOUT Delay (Note 7) ● 1.3 2.1 4 1.3 2.1 4 ns
DATA to CLOCKOUT Skew (tC - tD) (Note 7) ● –0.6 0 0.6 –0.6 0 0.6 ns
Output Enable Delay (Note 7) ● 510 510 ns
The ● denotes the specifications which apply over the full operating temperature
LTC2222 LTC2223
Duty Cycle Stabilizer On
Duty Cycle Stabilizer On
● 3 4.76 500 3 6.25 500 ns
● 3 4.76 500 3 6.25 500 ns
Note 1: Absolute Maximum Ratings are those values beyond which the life of
a device may be impaired.
Note 2: All voltage values are with respect to ground with GND and OGND
wired together (unless otherwise noted).
Note 3: When these pin voltages are taken below GND or above V
be clamped by internal diodes. This product can handle input currents of
greater than 100mA below GND or above V
Note 4: V
differential ENC
drive, unless otherwise noted.
= 3.3V, f
DD
SAMPLE
+
/ENC– = 2V
= 105MHz (LTC2222) or 80MHz (LTC2223),
sine wave, input range = 2V
P-P
without latchup.
DD
P-P
, they will
DD
with differential
Note 5: Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve. The
deviation is measured from the center of the quantization band.
Note 6: Offset error is the offset voltage measured from –0.5 LSB when the
output code flickers between 0000 0000 0000 and 1111 1111 1111 in 2’s
complement output mode.
Note 7: Guaranteed by design, not subject to test.
Note 8: V
differential ENC
drive.
= 3.3V, f
DD
+
SAMPLE
/ENC– = 2V
= 105MHz (LTC2222) or 80MHz (LTC2223),
sine wave, input range = 1V
P-P
with differential
P-P
22223f
5
LTC2222/LTC2223
UW
TYPICAL PERFOR A CE CHARACTERISTICS
LTC2222: INL, 2V Range LTC2222: DNL, 2V Range
1.0
0.8
0.6
0.4
0.2
0
–0.2
ERROR (LSB)
–0.4
–0.6
–0.8
–1.0
0
1024
2048
OUTPUT CODE
3072
4096
2222 G01
1.0
0.8
0.6
0.4
0.2
0
–0.2
ERROR (LSB)
–0.4
–0.6
–0.8
–1.0
0
1024
2048
OUTPUT CODE
3072
2222 G02
4096
LTC2222: SNR vs Input Frequency,
–1dB, 2V Range
70
69
68
67
66
65
64
SNR (dBFS)
63
62
61
60
0
100 200
INPUT FREQUENCY (MHz)
500 600300 400
2222 G03
LTC2222: SNR vs Input Frequency,
–1dB, 1V Range
70
69
68
67
66
65
64
SNR (dBFS)
63
62
61
60
0
100 200 500 600300 400
INPUT FREQUENCY (MHz)
LTC2222: SFDR (HD4+) vs Input
Frequency, –1dB, 2V Range
100
95
90
85
80
75
SFDR (dBFS)
70
65
60
55
0
200 300 400 500 600
100
INPUT FREQUENCY (MHz)
2222 G04
LTC2222: SFDR (HD2 and HD3) vs
Input Frequency, –1dB, 2V Range
100
95
90
85
80
75
SFDR (dBFS)
70
65
60
55
0
200 300 400
100
INPUT FREQUENCY (MHz)
LTC2222: SFDR (HD4+) vs Input
Frequency, –1dB, 1V Range
100
95
90
85
80
75
SFDR (dBFS)
70
65
60
55
0
200 300 400 500 600
100
INPUT FREQUENCY (MHz)
500 600
2222 G05
2222 G082222 G07
LTC2222: SFDR (HD2 and HD3) vs
Input Frequency, –1dB, 1V Range
100
95
90
85
80
75
SFDR (dBFS)
70
65
60
55
0
200 300 400 500 600
100
INPUT FREQUENCY (MHz)
LTC2222: SFDR and SNR vs
Sample Rate, 2V Range,
fIN = 30MHz, –1dB
100
95
90
85
80
75
SFDR AND SNR (dBFS)
70
65
60
20 60 100
0
SFDR
SNR
40 80
SAMPLE RATE (Msps)
2222 G06
120
2222 G09
6
22223f
UW
TYPICAL PERFOR A CE CHARACTERISTICS
LTC2222/LTC2223
LTC2222: SFDR and SNR vs
Sample Rate, 1V Range,
f
= 30MHz, –1dB
IN
100
95
90
85
80
75
70
65
SFDR AND SNR (dBFS)
60
55
50
20 60 100
0
SFDR
SNR
40 80
SAMPLE RATE (Msps)
LTC2222: SFDR vs Input Level,
fIN = 70MHz, 2V Range
100
90
80
70
60
50
40
30
SFDR (dBc AND dBFS)
20
10
0
–60
INPUT LEVELS (dBFS)
–40 –30 –20 –10 0–50
dBFS
dBc
LTC2222: IOV
LTC2222: IVDD vs Sample Rate,
5MHz Sine Wave Input, –1dB
130
120
110
100
2V RANGE
90
80
20
0
40
SAMPLE RATE (Msps)
(mA)
DD
IV
2223 G10 2223 G11 2223 G12
1V RANGE
60
80
100
LTC2222: 8192 Point FFT,
fIN = 5MHz, –1dB, 2V Range
0
–10
–20
–30
–40
–50
–60
–70
AMPLITUDE (dB)
–80
–90
–100
–110
2223 G13
–120
0
10 15 20
5
FREQUENCY (MHz)
25 30 35 40
2223 G14
5MHz Sine Wave Input,
–1dB,OV
8
6
(mA)
4
DD
IOV
2
0
20
0
LTC2222: 8192 Point FFT,
fIN = 5MHz, –1dB, 1V Range
0
–10
–20
–30
–40
–50
–60
–70
AMPLITUDE (dB)
–80
–90
–100
–110
–120
0
10 15 20
5
vs Sample Rate,
DD
= 1.8V
DD
60
40
SAMPLE RATE (Msps)
FREQUENCY (MHz)
25 30 35 40
80
2223 G15
100
LTC2222: 8192 Point FFT,
fIN = 30MHz, –1dB, 2V Range
0
–10
–20
–30
–40
–50
–60
–70
AMPLITUDE (dB)
–80
–90
–100
–110
–120
0
10 15 20
5
FREQUENCY (MHz)
25 30 35 40
2223 G16
LTC2222: 8192 Point FFT,
fIN = 30MHz, –1dB, 1V Range
0
–10
–20
–30
–40
–50
–60
–70
AMPLITUDE (dB)
–80
–90
–100
–110
–120
0
10 15 20
5
FREQUENCY (MHz)
25 30 35 40
2223 G17
LTC2222: 8192 Point FFT,
fIN = 70MHz, –1dB, 2V Range
0
–10
–20
–30
–40
–50
–60
–70
AMPLITUDE (dB)
–80
–90
–100
–110
–120
0
10 15 20
5
FREQUENCY (MHz)
25 30 35 40
2223 G18
22223f
7
LTC2222/LTC2223
UW
TYPICAL PERFOR A CE CHARACTERISTICS
LTC2222: 8192 Point FFT,
fIN = 70MHz, –1dB, 1V Range
0
–10
–20
–30
–40
–50
–60
–70
AMPLITUDE (dB)
–80
–90
–100
–110
–120
0
10 15 20
5
FREQUENCY (MHz)
25 30 35 40
LTC2222: 8192 Point FFT,
fIN = 250MHz, –1dB, 2V Range
0
–10
–20
–30
–40
–50
–60
–70
AMPLITUDE (dB)
–80
–90
–100
–110
–120
0
10 15 20
5
FREQUENCY (MHz)
25 30 35 40
2223 G19
2223 G22
LTC2222: 8192 Point FFT,
fIN = 140MHz, –1dB, 2V Range
0
–10
–20
–30
–40
–50
–60
–70
AMPLITUDE (dB)
–80
–90
–100
–110
–120
0
10 15 20
5
FREQUENCY (MHz)
25 30 35 40
LTC2222: 8192 Point FFT,
fIN = 250MHz, –1dB, 1V Range
0
–10
–20
–30
–40
–50
–60
–70
AMPLITUDE (dB)
–80
–90
–100
–110
–120
0
10 15 20
5
FREQUENCY (MHz)
25 30 35 40
2223 G20
2223 G23
LTC2222: 8192 Point FFT,
fIN = 140MHz, –1dB, 1V Range
0
–10
–20
–30
–40
–50
–60
–70
AMPLITUDE (dB)
–80
–90
–100
–110
–120
0
10 15 20
5
FREQUENCY (MHz)
25 30 35 40
LTC2222: 8192 Point FFT,
fIN = 500MHz, –6dB, 1V Range
0
–10
–20
–30
–40
–50
–60
–70
AMPLITUDE (dB)
–80
–90
–100
–110
–120
0
10 15 20
5
FREQUENCY (MHz)
25 30 35 40
2223 G21
2223 G24
LTC2222: 8192 Point 2-Tone FFT,
fIN = 68MHz and 70MHz, –7dB
Each, 2V Range
0
–10
–20
–30
–40
–50
–60
–70
AMPLITUDE (dB)
–80
–90
–100
–110
–120
0
10 15 20
5
FREQUENCY (MHz)
25 30 35 40
8
2223 G25
LTC2222: 8192 Point 2-Tone FFT,
fIN = 138MHz and 140MHz, –7dB
Each, 1V Range LTC2222: Noise Histogram
0
–10
–20
–30
–40
–50
–60
–70
AMPLITUDE (dB)
–80
–90
–100
–110
–120
0
5
10 15 20
FREQUENCY (MHz)
25 30 35 40
2223 G26
100000
80000
60000
COUNT
40000
20000
96679
16182
42 89
0
2044
2045
2046
CODE
18080
2047
2048
2223 G27
22223f
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