Digital Output Ground Voltage (OGND) ........ –0.3V to 1V
Analog Input Voltage (Note 3) .......–0.3V to (V
DD
+ 0.3V)
Digital Input Voltage......................–0.3V to (V
DD
+ 0.3V)
Digital Output Voltage ................ –0.3V to (OV
DD
+ 0.3V)
OV
DD
= V
DD
(Notes 1, 2)
Power Dissipation .............................................1500mW
Operating Temperature Range
LTC2240C-10 ........................................... 0°C to 70°C
LTC2240I-10 ........................................–40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
64 GND
63 V
DD
62 V
DD
61 GND
60 V
CM
59 SENSE
58 MODE
57 LVDS
56 OF
+
/OFA
55 OF
–
/DA9
54 D9
+
/DA8
53 D9
–
/DA7
52 D8
+
/DA6
51 D8
–
/DA5
50 OGND
49 OV
DD
A
IN+
1
A
IN+
2
A
IN–
3
A
IN–
4
REFHA 5
REFHA 6
REFLB 7
REFLB 8
REFHB 9
REFHB 10
REFLA 11
REFLA 12
V
DD
13
V
DD
14
V
DD
15
GND 16
65
48 D7
+
/DA4
47 D7
–
/DA3
46 D6
+
/DA2
45 D6
–
/DA1
44 D5
+
/DA0
43 D5
–
/DNC
42 OV
DD
41 OGND
40 D4
+
/DNC
39 D4
–
/CLKOUTA
38 D3
+
/CLKOUTB
37 D3
–
/OFB
36 CLKOUT
+
/DB9
35 CLKOUT
–
/DB8
34 OV
DD
33 OGND
UP PACKAGE
64-LEAD (9mm
×
9mm) PLASTIC QFN
EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB
T
JMAX
= 150°C,
θ
JA
= 20°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC2240CUP-10#PBF
LTC2240IUP-10#PBF
LEAD BASED FINISH
LTC2240CUP-10
LTC2240IUP-10
TAPE AND REEL
LTC2240CUP-10#TRPBF
LTC2240IUP-10#TRPBF
TAPE AND REEL
LTC2240CUP-10#TR
LTC2240IUP-10#TR
PART MARKING*
LTC2240UP-10
LTC2240UP-10
PART MARKING*
LTC2240UP-10
LTC2240UP-10
PACKAGE DESCRIPTION
64-Lead (9mm
×
9mm) Plastic QFN
64-Lead (9mm
×
9mm) Plastic QFN
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
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *Temperature grades are identified by a label on the shipping container.
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/
ENC
+
17
ENC
–
18
SHDN 19
OE
20
DNC 21
DNC 22
DNC/DB0 23
DNC/DB1 24
OGND 25
OV
DD
26
D0
–
/DB2 27
D0
+
/DB3 28
D1
–
/DB4 29
D1
+
/DB5 30
D2
–
/DB6 31
D2
+
/DB7 32
224010fb
2
LTC2240-10
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
SENSE = 1V
Differential Analog Input (Note 5)
Differential Analog Input
(Note 6)
External Reference
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
CONDITIONS
l
l
l
l
l
MIN
10
–0.8
–0.6
–15
–3.8
TYP
±0.3
±0.1
±5
±0.7
±10
±60
±45
0.18
MAX
0.8
0.6
15
3.8
UNITS
Bits
LSB
LSB
mV
%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 4)
SYMBOL
V
IN
V
IN, CM
I
IN
I
SENSE
I
MODE
I
LVDS
t
AP
t
JITTER
PARAMETER
Analog Input Range (A
IN+
– A
IN–
)
Analog Input Common Mode (A
IN+
+ A
IN–
)/2
Analog Input Leakage Current
SENSE Input Leakage
MODE Pin Pull-Down Current to GND
LVDS Pin Pull-Down Current to GND
Sample and Hold Acquisition Delay Time
Sample and Hold Acquisition Delay Time Jitter
Full Power Bandwidth
Figure 8 Test Circuit
CONDITIONS
2.375V < V
DD
< 2.625V (Note 7)
Differential Input (Note 7)
0 < A
IN+
, A
IN–
< V
DD
0V < SENSE < 1V
l
l
l
l
MIN
1.2
–1
–1
TYP
±0.5 to ±1
1.25
MAX
1.3
1
1
UNITS
V
V
μA
μA
μA
μA
ns
fs
RMS
MHz
7
7
0.4
95
1200
DYNAMIC ACCURACY
SYMBOL
SNR
PARAMETER
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 4)
CONDITIONS
10MHz Input
70MHz Input
140MHz Input
240MHz Input
SFDR
Spurious Free Dynamic Range
2nd or 3rd Harmonic
(Note 11)
10MHz Input
70MHz Input
140MHz Input
240MHz Input
Spurious Free Dynamic Range
4th Harmonic or Higher
(Note 11)
10MHz Input
70MHz Input
140MHz Input
240MHz Input
l
l
l
MIN
59.7
TYP
60.6
60.6
60.5
60.5
80
MAX
UNITS
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
Signal-to-Noise Ratio (Note 10)
65
75
74
72
85
74
85
85
85
224010fb
3
LTC2240-10
DYNAMIC ACCURACY
SYMBOL
S/(N+D)
PARAMETER
Signal-to-Noise Plus
Distortion Ratio
(Note 12)
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 4)
CONDITIONS
10MHz Input
70MHz Input
140MHz Input
240MHz Input
IMD
Intermodulation Distortion
f
IN1
= 135MHz, f
IN2
= 140MHz
l
MIN
59.1
TYP
60.5
60.5
60.4
60.1
81
MAX
UNITS
dB
dB
dB
dB
dBc
INTERNAL REFERENCE CHARACTERISTICS
(Note 4)
PARAMETER
V
CM
Output Voltage
V
CM
Output Tempco
V
CM
Line Regulation
V
CM
Output Resistance
2.375V < V
DD
< 2.625V
–1mA < I
OUT
< 1mA
CONDITIONS
I
OUT
= 0
MIN
1.225
TYP
1.25
±35
3
2
MAX
1.275
UNITS
V
ppm/°C
mV/V
Ω
DIGITAL INPUTS AND DIGITAL OUTPUTS
SYMBOL
V
ID
V
ICM
R
IN
C
IN
V
IH
V
IL
I
IN
C
IN
OV
DD
= 2.5V
C
OZ
I
SOURCE
I
SINK
V
OH
V
OL
OV
DD
= 1.8V
V
OH
V
OL
High Level Output Voltage
Low Level Output Voltage
I
O
= –500μA
I
O
= 500μA
Hi-Z Output Capacitance
Output Source Current
Output Sink Current
High Level Output Voltage
Low Level Output Voltage
OE
= High (Note 7)
V
OUT
= 0V
V
OUT
= 2.5V
I
O
= –10μA
I
O
= –500μA
PARAMETER
Differential Input Voltage
Common Mode Input Voltage
Input Resistance
Input Capacitance
High Level Input Voltage
Low Level Input Voltage
Input Current
Input Capacitance
(Note 7)
V
DD
= 2.5V
V
DD
= 2.5V
V
IN
= 0V to V
DD
(Note 7)
CONDITIONS
(Note 7)
Internally Set
Externally Set (Note 7)
ENCODE INPUTS (ENC
+
, ENC
–
)
The
l
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
MIN
l
l
TYP
MAX
UNITS
V
0.2
1.2
1.5
1.5
4.8
2
2.0
V
V
kΩ
pF
V
LOGIC INPUTS (OE, SHDN)
l
l
l
1.7
0.7
–10
3
10
V
μA
pF
LOGIC OUTPUTS (CMOS MODE)
3
37
23
2.495
2.45
0.005
0.07
1.75
0.07
pF
mA
mA
V
V
V
V
V
V
224010fb
4
LTC2240-10
DIGITAL INPUTS AND DIGITAL OUTPUTS
SYMBOL
V
OD
V
OS
PARAMETER
Differential Output Voltage
Output Common Mode Voltage
CONDITIONS
100Ω Differential Load
100Ω Differential Load
l
l
The
l
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
MIN
247
1.125
TYP
350
1.250
MAX
454
1.375
UNITS
mV
V
LOGIC OUTPUTS (LVDS MODE)
POWER REQUIREMENTS
SYMBOL
V
DD
P
SLEEP
P
NAP
LVDS OUTPUT MOD
OV
DD
I
VDD
I
OVDD
P
DISS
OV
DD
I
VDD
P
DISS
Output Supply Voltag
Analog Supply Current
Output Supply Current
Power Dissipation
Output Supply Voltage
Analog Supply Current
Power Dissipation
PARAMETER
Analog Supply Voltage
Sleep Mode Power
Nap Mode Power
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 9)
CONDITIONS
(Note 8)
SHDN = High,
OE
= High, No CLK
SHDN = High,
OE
= Low, No CLK
(Note 8)
l
l
l
l
l
l
l
MIN
2.375
TYP
2.5
1
28
MAX
2.625
UNITS
V
mW
mW
2.375
2.5
170
58
570
2.625
185
70
638
2.625
185
V
mA
mA
mW
V
mA
mW
CMOS OUTPUT MODE
(Note 8)
(Note 7)
0.5
2.5
170
445
TIMING CHARACTERISTICS
SYMBOL
f
S
t
L
t
H
t
AP
t
OE
LVDS OUTPUT MODE
t
D
t
C
ENC to DATA Delay
ENC to CLKOUT Delay
DATA to CLKOUT Skew
Rise Time
Fall Time
Pipeline Latency
CMOS OUTPUT MODE
t
D
t
C
ENC to DATA Delay
ENC to CLKOUT Delay
PARAMETER
Sampling Frequency
ENC Low Time (Note 7)
ENC High Time (Note 7)
Sample-and-Hold Aperture Delay
Output Enable Delay
The
l
denotes the specifications which apply over the full operating temperature
1. Introduction
Electronic scales are gradually replacing traditional measuring tools like springs and balances in everyday life, such as electronic price computing scales and electronic weigh...[详细]
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