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)
Power Dissipation .............................................1500mW
Operating Temperature Range
LTC2228C, LTC2227C, LTC2226C............. 0°C to 70°C
LTC2228I, LTC2227I, LTC2226I ............ –40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
32 31 30 29 28 27 26 25
A
IN+
1
A
IN–
2
REFH 3
REFH 4
REFL 5
REFL 6
V
DD
7
GND 8
UH PACKAGE
32-LEAD (5mm 5mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 34°C/W
EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC2228CUH#PBF
LTC2228IUH#PBF
LTC2227CUH#PBF
LTC2227IUH#PBF
LTC2226CUH#PBF
LTC2226IUH#PBF
LEAD BASED FINISH
LTC2228CUH
LTC2228IUH
LTC2227CUH
LTC2227IUH
LTC2226CUH
LTC2226IUH
TAPE AND REEL
LTC2228CUH#TRPBF
LTC2228IUH#TRPBF
LTC2227CUH#TRPBF
LTC2227IUH#TRPBF
LTC2226CUH#TRPBF
LTC2226IUH#TRPBF
TAPE AND REEL
LTC2228CUH#TR
LTC2228IUH#TR
LTC2227CUH#TR
LTC2227IUH#TR
LTC2226CUH#TR
LTC2226IUH#TR
PART MARKING*
2228
2228
2227
2227
2226
2226
PART MARKING*
2228
2228
2227
2227
2226
2226
PACKAGE DESCRIPTION
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
PACKAGE DESCRIPTION
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
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.
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/
222876fb
2
LTC2228/LTC2227/LTC2226
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
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. (Note 4)
MIN
12
–1.1
–0.8
–12
–2.5
±0.3
±0.15
±2
±0.5
±10
±30
±5
0.25
1.1
0.8
12
2.5
LTC2228
TYP
MAX
MIN
12
–1
–0.7
–12
–2.5
±0.3
±0.15
±2
±0.5
±10
±30
±5
0.25
1
0.7
12
2.5
LTC2227
TYP
MAX
MIN
12
–1
–0.7
–12
–2.5
±0.3
±0.15
±2
±0.5
±10
±30
±5
0.25
1
0.7
12
2.5
LTC2226
TYP
MAX
UNITS
Bits
LSB
LSB
mV
%FS
μV/°C
ppm/°C
ppm/°C
LSB
RMS
ANALOG INPUT
SYMBOL
V
IN
V
IN,CM
I
IN
I
SENSE
I
MODE
t
AP
t
JITTER
CMRR
PARAMETER
The
l
denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 4)
CONDITIONS
2.7V < V
DD
< 3.4V (Note 7)
Differential Input (Note 7)
Single-Ended Input (Note 7)
0V < A
IN+
, A
IN–
< V
DD
0V < SENSE < 1V
l
l
l
l
l
l
MIN
1
0.5
–1
–3
–3
TYP
±0.5V to ±1V
1.5
1.5
MAX
1.9
2
1
3
3
UNITS
V
V
V
μA
μA
μA
ns
ps
RMS
dB
MHz
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 Leakage
Sample-and-Hold Acquisition Delay Time
Sample-and-Hold Acquisition Delay Time Jitter
Analog Input Common Mode Rejection Ratio
Full Power Bandwidth
0
0.2
80
Figure 8 Test Circuit
575
DYNAMIC ACCURACY
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)
SYMBOL PARAMETER
SNR
Signal-to-Noise Ratio
CONDITIONS
5MHz Input
12.5MHz Input
20MHz Input
30MHz Input
70MHz Input
140MHz Input
5MHz Input
12.5MHz Input
20MHz Input
30MHz Input
70MHz Input
140MHz Input
l
l
l
MIN
LTC2228
TYP
MAX
71.3
MIN
LTC2227
TYP
MAX
71.4
MIN
70.2
LTC2226
TYP
MAX
71.4
71.2
UNITS
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
222876fb
70.1
70
71.3
71.3
71
90
76
75
90
85
80
71.3
71.1
70.7
90
76
90
85
80
85
80
70.9
70.6
90
90
SFDR
Spurious Free
Dynamic Range
2nd or 3rd
Harmonic
l
l
l
3
LTC2228/LTC2227/LTC2226
DYNAMIC ACCURACY
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
5MHz Input
12.5MHz Input
20MHz Input
30MHz Input
70MHz Input
140MHz Input
5MHz Input
12.5MHz Input
20MHz Input
30MHz Input
70MHz Input
140MHz Input
f
IN1
= 28.2MHz,
f
IN2
= 26.8MHz
l
l
l
SYMBOL PARAMETER
SFDR
Spurious Free
Dynamic Range
4th Harmonic
or Higher
MIN
LTC2228
TYP
MAX
95
MIN
LTC2227
TYP
MAX
95
MIN
82
LTC2226
TYP
MAX
95
95
UNITS
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
82
82
95
95
90
71.3
69.7
69.6
71.2
71.1
69.9
90
95
95
90
71.4
69.8
71.2
70.9
69.9
90
70.8
69.8
90
95
90
71.4
71.2
S/(N+D)
Signal-to-Noise
Plus Distortion
Ratio
l
l
l
IMD
Intermodulation
Distortion
INTERNAL REFERENCE CHARACTERISTICS
(Note 4)
PARAMETER
V
CM
Output Voltage
V
CM
Output Tempco
V
CM
Line Regulation
V
CM
Output Resistance
CONDITIONS
I
OUT
= 0
2.7V < V
DD
< 3.4V
–1mA < I
OUT
< 1mA
MIN
1.475
TYP
1.500
±25
3
4
MAX
1.525
UNITS
V
ppm/°C
mV/V
Ω
DIGITAL INPUTS AND DIGITAL OUTPUTS
The
l
denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
CONDITIONS
V
DD
= 3V
V
DD
= 3V
V
IN
= 0V to V
DD
(Note 7)
l
l
l
SYMBOL PARAMETER
LOGIC INPUTS (CLK,
OE,
SHDN)
High Level Input Voltage
V
IH
Low Level Input Voltage
V
IL
Input Current
I
IN
Input Capacitance
C
IN
LOGIC OUTPUTS
OV
DD
= 3V
Hi-Z Output Capacitance
C
OZ
Output Source Current
I
SOURCE
Output Sink Current
I
SINK
High Level Output Voltage
V
OH
V
OL
Low Level Output Voltage
MIN
2
–10
TYP
MAX
UNITS
V
V
μA
pF
0.8
10
3
OE
= High (Note 7)
V
OUT
= 0V
V
OUT
= 3V
I
O
= –10μA
I
O
= –200μA
I
O
= 10μA
I
O
= 1.6mA
I
O
= –200μA
I
O
= 1.6mA
I
O
= –200μA
I
O
= 1.6mA
l
l
2.7
3
50
50
2.995
2.99
0.005
0.09
2.49
0.09
1.79
0.09
0.4
pF
mA
mA
V
V
V
V
V
V
V
V
222876fb
OV
DD
= 2.5V
High Level Output Voltage
V
OH
Low Level Output Voltage
V
OL
OV
DD
= 1.8V
High Level Output Voltage
V
OH
Low Level Output Voltage
V
OL
4
LTC2228/LTC2227/LTC2226
POWER REQUIREMENTS
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 8)
CONDITIONS
l
l
l
l
SYMBOL PARAMETER
V
DD
OV
DD
I
VDD
P
DISS
P
SHDN
P
NAP
LTC2228
MIN
TYP
MAX
2.7
0.5
3
3
68.3
205
2
15
3.4
3.6
80
240
LTC2227
MIN
TYP
MAX
2.7
0.5
3
3
40
120
2
15
3.4
3.6
48
144
LTC2226
MIN
TYP
MAX
2.7
0.5
3
3
25
75
2
15
3.4
3.6
30
90
UNITS
V
V
mA
mW
mW
mW
Analog Supply Voltage (Note 9)
Output Supply Voltage (Note 9)
Supply Current
Power Dissipation
Shutdown Power
Nap Mode Power
SHDN = H,
OE
= H,
No CLK
SHDN = H,
OE
= L,
No CLK
TIMING CHARACTERISTICS
SYMBOL
f
S
t
L
PARAMETER
Sampling Frequency
CLK Low Time
CONDITIONS
(Note 9)
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 4)
LTC2228
MIN
TYP
MAX
l
l
l
l
l
LTC2227
MIN
TYP
MAX
1
11.8
5
11.8
5
12.5
40
500
500
500
500
LTC2226
MIN
TYP
MAX
1
18.9
5
18.9
5
20
20
20
20
0
25
500
500
500
500
UNITS
MHz
ns
ns
ns
ns
ns
1
7.3
5
7.3
5
7.7
7.7
7.7
7.7
0
65
500
500
500
500
Duty Cycle Stabilizer Off
Duty Cycle Stabilizer On
(Note 7)
Duty Cycle Stabilizer Off
Duty Cycle Stabilizer On
(Note 7)
t
H
CLK High Time
12.5
12.5
0
t
AP
t
D
Sample-and-Hold
Aperture Delay
CLK to DATA Delay
Data Access Time
After
OE↓
BUS Relinquish Time
C
L
= 5pF (Note 7)
C
L
= 5pF (Note 7)
(Note 7)
l
l
l
1.4
2.7
4.3
3.3
5
5.4
10
8.5
1.4
2.7
4.3
3.3
5
5.4
10
8.5
1.4
2.7
4.3
3.3
5
5.4
10
8.5
ns
ns
ns
Cycles
Pipeline
Latency
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
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
DD
, they
will be clamped by internal diodes. This product can handle input currents
of greater than 100mA below GND or above V
DD
without latchup.
Note 4:
V
DD
= 3V, f
SAMPLE
= 65MHz (LTC2228), 40MHz (LTC2227), or
25MHz (LTC2226), input range = 2V
P-P
with differential drive, unless
otherwise noted.
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.
射频识别(Radio Frequency Identification，RFID)技术是一种利用无线射频通信实现的非接触式自动识别技术，与目前广泛采用的条形码技术相比，RFID具有容量大、识别距离远、穿透能力强、抗污性强等特点。RFID技术已经发展得比较成熟并获得了大规模商用，但超高频RFID技术相对滞后。本文分析了射频芯片nRF9E5的功能特性，并将其用于RFID系统中，设计了一套有源超高频(...[详细]
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