參數(shù)資料
型號(hào)： THS770012IRGET
廠商： TEXAS INSTRUMENTS INC
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PQCC24
封裝： GREEN, PLASTIC, VQFN-24
文件頁數(shù)： 11/35頁
文件大?。?/td> 1305K
代理商： THS770012IRGET
50W
200W
V
OUT+
V
OUT-
200W
Differential
Output
Bias and
Impedance
Match
THS770012
V
REF
Single-Ended
Input
(140 || 200
60) (140
200)
242
200
+
+
=
W
SLOS669B
– FEBRUARY 2010 – REVISED MAY 2011
Single-Ended to Differential
The THS770012 can be used to amplify and convert single-ended input signals to differential output signals. A
basic block diagram of the circuit with nominal gain of +12dB is shown in Figure 39. In order to maintain proper
balance in the amplifier and avoid offsets at the output, the alternate input must be biased and the impedance
matched to the signal input. For example, if a 50
source biased to 2.5V provides the input, the alternate input
should be tied to 2.5V through 50
. If a 50 source is ac-coupled to the input, the alternate input should be
ac-coupled to ground through 50
. Note that the ac coupling should provide a similar frequency response to
balance the gain over frequency.
Figure 39. Single-Ended Input to Differential Output Amplifier
Setting the Gain
Gain is adjustable by placing external components in positions R11, R12, R13, and R14 on the EVM. Table 2
below shows the component values for setting gain from +10dB to +13.7dB. The different configurations and
values change the effective value of the internal feedback, where the gain is determined by the resultant effective
RF/RG, where RG = 50
Table 2. Gain Settings
GAIN
R11, R12
R13, R14
EFFECTIVE RF
+10dB
Open
140
140 || 340 + 60 = 159
Ω
+11dB
Open
523
140 || 723 + 60 = 177
Ω
+12dB
Open
140 + 60 = 200
Ω
+13.7dB (AC gain), +12dB
0.1
F capacitors
Open
(DC gain)(1)
(1)
Using 0.1
F capacitors for R11 and R12 limits the low frequency response to the default value of +12dB at frequency below about
10kHz. For +13.7dB gain at DC, connect pins 13 and 18 of the device to a low impedance voltage source equal to VOCM (+2.5V
nominal).
Setting the Output Common-Mode Voltage
The VOCM input controls the output common-mode voltage. VOCM has no internal biasing network and must be
driven by an external source or resistor divider network to the positive power supply. In ac-coupled applications,
the VOCM input impedance and bias current are not critical, but in dc-coupled applications where more accuracy
is desired, the input bias current of the pin should be considered. For best harmonic distortion with VOUT = 3VPP,
the VOCM input should be maintained within the operating range of 2.25V to 2.75V. The VOCM input voltage can
be operated outside this range if lower output swing is used or distortion degradation is allowed, and increased
bias current into the pin is acceptable. For more information, see Figure 18 and Figure 34. It is recommended to
use a 0.1
F decoupling capacitor from the VOCM pin to ground to prevent noise and other spurious signals from
coupling into the common-mode loop of the amplifier.
Input Common-Mode Voltage Range
The THS770012 is designed primarily for ac-coupled operation. With input dc blocking, the input common-mode
voltage of the device is driven to the same voltage as VOCM by the outputs. Therefore, as long as the VOCM input
is maintained within the operating range of 2.25V to 2.75V, the input common-mode of the main amplifier is also
maintained within its linear operating range of 2.25V to 2.75V. If the device is used with dc coupled input, the
driving source needs to bias the input to its linear operating range of 2.25V to 2.75V for proper operation.
Copyright
2010–2011, Texas Instruments Incorporated
19
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