16-bit A/D converter designed 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.
Two-Channel Simultaneously Sampling ADC
77dB SNR
90dB SFDR
Low Power: 76mW Total, 38mW per Channel
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
64-Lead (9mm
×
9mm) QFN Package
applicaTions
n
n
n
n
n
n
Communications
Cellular Base Stations
Software Defined Radios
Portable Medical Imaging
Multi-Channel Data Acquisition
Nondestructive Testing
Typical applicaTion
1.8V
V
DD
1.8V
OV
DD
4.0
3.0
CH 1
ANALOG
INPUT
S/H
16-BIT
ADC CORE
D1_15
•
•
•
D1_0
OUTPUT
DRIVERS
D2_15
•
•
•
D2_0
2.0
INL ERROR (LSB)
CMOS,
DDR CMOS
OR DDR LVDS
OUTPUTS
1.0
0
–1.0
–2.0
–3.0
–4.0
20MHz
CLOCK
GND
CLOCK
CONTROL
2188 TA01a
Integral Non-Linearity (INL)
CH 2
ANALOG
INPUT
S/H
16-BIT
ADC CORE
0
16384
32768
49152
OUTPUT CODE
65536
2188 TA01b
OGND
2188f
1
LTC2188
absoluTe MaxiMuM raTings
(Notes 1, 2)
Supply Voltages (V
DD
, OV
DD
) ....................... –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
LTC2188C ................................................ 0°C to 70°C
LTC2188I .............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
pin conFiguraTions
FULL-RATE CMOS OUTPUT MODE
TOP VIEW
64 V
DD
63 SENSE
62 V
REF
61 SDO
60 OF1
59 OF2
58 D1_15
57 D1_14
56 D1_13
55 D1_12
54 D1_11
53 D1_10
52 D1_9
51 D1_8
50 D1_7
49 D1_6
DOUBLE DATA RATE CMOS OUTPUT MODE
TOP VIEW
64 V
DD
63 SENSE
62 V
REF
61 SDO
60 OF2_1
59 DNC
58 D1_14_15
57 DNC
56 D1_12_13
55 DNC
54 D1_10_11
53 DNC
52 D1_8_9
51 DNC
50 D1_6_7
49 DNC
48 D1_5
47 D1_4
46 D1_3
45 D1_2
44 D1_1
43 D1_0
42 OV
DD
41 OGND
40 CLKOUT
+
39 CLKOUT
–
38 D2_15
37 D2_14
36 D2_13
35 D2_12
34 D2_11
33 D2_10
V
DD
1
V
CM1
2
GND 3
A
IN1+
4
A
IN1–
5
GND 6
REFH 7
REFL 8
REFH 9
REFL 10
PAR/SER 11
A
IN2+
12
A
IN2–
13
GND 14
V
CM2
15
V
DD
16
65
GND
48 D1_4_5
47 DNC
46 D1_2_3
45 DNC
44 D1_0_1
43 DNC
42 OV
DD
41 OGND
40 CLKOUT
+
39 CLKOUT
–
38 D2_14_15
37 DNC
36 D2_12_13
35 DNC
34 D2_10_11
33 DNC
UP PACKAGE
64-LEAD (9mm
×
9mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 20°C/W
EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB
V
DD
17
ENC
+
18
ENC
–
19
CS
20
SCK 21
SDI 22
DNC 23
D2_0_1 24
DNC 25
D2_2_3 26
DNC 27
D2_4_5 28
DNC 29
D2_6_7 30
DNC 31
D2_8_9 32
V
DD
1
V
CM1
2
GND 3
A
IN1+
4
A
IN1–
5
GND 6
REFH 7
REFL 8
REFH 9
REFL 10
PAR/SER 11
A
IN2+
12
A
IN2–
13
GND 14
V
CM2
15
V
DD
16
65
GND
UP PACKAGE
64-LEAD (9mm
×
9mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 20°C/W
EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB
V
DD
17
ENC
+
18
ENC
–
19
CS
20
SCK 21
SDI 22
D2_0 23
D2_1 24
D2_2 25
D2_3 26
D2_4 27
D2_5 28
D2_6 29
D2_7 30
D2_8 31
D2_9 32
2188f
2
LTC2188
pin conFiguraTions
DOUBLE DATA RATE LVDS OUTPUT MODE
TOP VIEW
64 V
DD
63 SENSE
62 V
REF
61 SDO
60 OF2_1
+
59 OF2_1
–
58 D1_14_15
+
57 D1_14_15
–
56 D1_12_13
+
55 D1_12_13
–
54 D1_10_11
+
53 D1_10_11
–
52 D1_8_9
+
51 D1_8_9
–
50 D1_6_7
+
49 D1_6_7
–
V
DD
1
V
CM1
2
GND 3
A
IN1+
4
A
IN1–
5
GND 6
REFH 7
REFL 8
REFH 9
REFL 10
PAR/SER 11
A
IN2+
12
A
IN2–
13
GND 14
V
CM2
15
V
DD
16
65
GND
48 D1_4_5
+
47 D1_4_5
–
46 D1_2_3
+
45 D1_2_3
–
44 D1_0_1
+
43 D1_0_1
–
42 OV
DD
41 OGND
40 CLKOUT
+
39 CLKOUT
–
38 D2_14_15
+
37 D2_14_15
–
36 D2_12_13
+
35 D2_12_13
–
34 D2_10_11
+
33 D2_10_11
–
UP PACKAGE
64-LEAD (9mm
×
9mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 20°C/W
EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LTC2188CUP#PBF
LTC2188IUP#PBF
TAPE AND REEL
LTC2188CUP#TRPBF
LTC2188IUP#TRPBF
PART MARKING*
LTC2188UP
LTC2188UP
PACKAGE DESCRIPTION
64-Lead (9mm
×
9mm) Plastic QFN
64-Lead (9mm
×
9mm) 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
17
ENC
+
18
ENC
–
19
CS
20
SCK 21
SDI 22
D2_0_1
–
23
D2_0_1
+
24
D2_2_3
–
25
D2_2_3
+
26
D2_4_5
–
27
D2_4_5
+
28
D2_6_7
–
29
D2_6_7
+
30
D2_8_9
–
31
D2_8_9
+
32
2188f
3
LTC2188
converTer characTerisTics
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
PARAMETER
Resolution (No Missing Codes)
Integral Linearity Error
Differential Linearity Error
Offset Error
Gain Error
Offset Drift
Full-Scale Drift
Gain Matching
Offset Matching
Transition Noise
Internal Reference
External Reference
Differential Analog Input (Note 6)
Differential Analog Input
(Note 7)
Internal Reference
External Reference
CONDITIONS
l
l
l
l
l
MIN
16
–6.5
–0.9
–7
–1.8
TYP
±2
±0.5
±1.5
±1.5
–0.5
±10
±30
±10
±0.3
±1.5
3.2
MAX
6.5
0.9
7
0.8
UNITS
Bits
LSB
LSB
mV
%FS
%FS
µV/°C
ppm/°C
ppm/°C
%FS
mV
LSB
RMS
analog inpuT
SYMBOL PARAMETER
V
IN
V
IN(CM)
V
SENSE
I
INCM
I
IN1
I
IN2
I
IN3
t
AP
t
JITTER
CMRR
BW-3B
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)
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
–6
TYP
1 to 2
V
CM
1.250
32
MAX
1.25
1.300
1
3
6
UNITS
V
P-P
V
V
µA
µA
µA
µA
ns
ps
RMS
ps
RMS
dB
MHz
Analog Input Range (A
IN+
– A
IN–
)
Analog Input Common Mode (A
IN+
+ A
IN–
)/2
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
External Voltage Reference Applied to SENSE External Reference Mode
0
0.07
0.09
80
550
2188f
4
LTC2188
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)
SYMBOL
SNR
PARAMETER
Signal-to-Noise Ratio
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
5MHz Input
30MHz Input
70MHz Input
140MHz Input
5MHz Input
30MHz Input
70MHz Input
140MHz Input
10MHz Input
l
DynaMic accuracy
MIN
75.3
TYP
77.1
77
76.9
76.4
90
90
89
84
90
90
89
84
95
95
95
95
76.9
76.8
76.5
76.4
–110
MAX
UNITS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBc
SFDR
Spurious Free Dynamic Range 2nd Harmonic
l
84
Spurious Free Dynamic Range 3rd Harmonic
l
84
Spurious Free Dynamic Range 4th Harmonic or Higher
l
89
S/(N+D)
Signal-to-Noise Plus Distortion Ratio
l
74.9
Crosstalk
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
C++ 属于面向对象的编程语言，OOP的思想不必多说，特别对于复杂的软件工程来说，利用OOP绝对是事半功倍，相对于传统的C来说； 当然用C来写单片机程序无可厚非，已经延续了一个传统，从大学时学的开始到工作岗位，好多人都是一直用C来做，但是既然Keil支持C++编译， 可以用C++来编写你的代码，可以利用高级语言来结构化，清晰化你的程序，为嘛不用呢！哈哈，个人看法！下面进入正题： C+...[详细]
微控制器 MCU
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
