LTC1758-1EMS8 Linear Technology, LTC1758-1EMS8 Datasheet - Page 11

• Manufacturer Part Number: LTC1758-1EMS8
• Description: IC RF PWR CONTRLLR SINGLE 8-MSOP
• Manufacturer: Linear Technology

Specifications of LTC1758-1EMS8

• Rf Type: Cellular, GSM, GPRS, PCS, Wireless Modem, TDMA
• Frequency: 850MHz ~ 2GHz
• Features: Single Output
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIO S I FOR ATIO
This model (Figure 7) is being supplied to LTC users as an
aid to circuit designs. While the model reflects close
similarity to corresponding devices in low frequency AC
performance terms, its use is not suggested as a replace-
ment for breadboarding. Simulation should be used as a
forerunner or a supplement to traditional lab testing.
Users should note very carefully the following factors
regarding this model: Model performance in general will
reflect typical baseline specs for a given device, and
certain aspects of performance may not be modeled fully.
While reasonable care has been taken in the preparation,
we cannot be responsible for correct application on any
and all computer systems. Model users are hereby notified
that these models are supplied “as is”, with no direct or
implied responsibility on the part of LTC for their operation
within a customer circuit or system. Further, Linear Tech-
nology Corporation reserves the right to change these
models without prior notice.
In all cases, the current data sheet information is your final
design guideline, and is the only performance guarantee.
For further technical information, refer to individual device
data sheets. Your feedback and suggestions on this model
is appreciated.
PCTL
+
I
Figure 5. Closed Loop Block Diagram
FB
–
BW1 250kHz
RF DETECTOR
AMPLIFER
CONTROL
LTC1758
U
G1
H1
V
U
RF
PCA/B
14dB to 20dB LOSS
RF POWER AMP
DIRECTIONAL
COUPLER
G2
H2
W
1758 F05
CONTROLLED
RF OUTPUT
POWER
U
Linear Technology Corporation hereby grants the users of
this model a nonexclusive, nontransferable license to use
this model under the following conditions:
The user agrees that this model is licensed from Linear
Technology and agrees that the model may be used,
loaned, given away or included in other model libraries as
long as this notice and the model in its entirety and
unchanged is included. No right to make derivative works
or modifications to the model is granted hereby. All such
rights are reserved.
This model is provided as is. Linear Technology makes no
warranty, either expressed or implied about the suitability
or fitness of this model for any particular purpose. In no
event will Linear Technology be liable for special, collat-
eral, incidental or consequential damages in connection
with or arising out of the use of this model. It should be
remembered that models are a simplification of the actual
circuit.
Figure 6. SPICE Model Open Loop Gain and Phase
Characteristics from RF to V
–20
–30
–40
–50
–60
–10
80
70
60
50
40
30
20
10
0
100
LTC1758-1/LTC1758-2
1k
FREQUENCY (Hz)
10k
PHASE
GAIN
100k
PCA
R
C
LOAD
LOAD
, PCTL < 640mV
1M
= 33pF
= 2k
1758
10M
F06
120
110
100
90
80
70
60
50
40
30
20
10
0
–10
–20
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