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参数资料
| 型号： | AD9714-DPG2-EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 39/80页 |
| 文件大小： | 0K |
| 描述： | ADC 8BIT DUAL 40LFCSP |
| 标准包装： | 1 |
| 系列： | TxDAC® |
| DAC 的数量： | 2 |
| 位数： | 8 |
| 采样率（每秒）： | 125M |
| 数据接口： | 串行 |
| DAC 型： | 电流 |
| 工作温度： | -40°C ~ 85°C |
| 已供物品： | 板 |
| 已用 IC / 零件： | AD9714 |
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AD9714/AD9715/AD9716/AD9717
Rev. A | Page 44 of 80
DAC TRANSFER FUNCTION
The AD9714/AD9715/AD9716/AD9717 provide two differen-
tial current outputs, IOUTP/IOUTN and QOUTP/QOUTN.
IOUTP and QOUTP provide a near full-scale current output,
IxOUTFS, when all bits are high (that is, DAC CODE = 2N 1,
where N = 8, 10, 12, or 14 for the AD9714, AD9715, AD9716,
and AD9717, respectively), while IOUTN and QOUTN, the
complementary outputs, provide no current. The current
outputs appearing at the positive DAC outputs, IOUTP and
QOUTP, and at the negative DAC outputs, IOUTN and QOUTN,
are a function of both the input code and IxOUTFS and can be
expressed as follows:
IOUTP = (IDAC CODE/2N) × IIOUTFS
(1)
QOUTP = (QDAC CODE/2N) × IQOUTFS
IOUTN = ((2N 1) IDAC CODE)/2N × IIOUTFS
(2)
QOUTN = ((2N 1) QDAC CODE)/2N × IQOUTFS
where:
IDAC CODE and QDAC CODE = 0 to 2N 1 (that is, decimal
representation).
IIOUTFS and IQOUTFS are functions of the reference currents, IIREF
and IQREF, respectively, which are nominally set by a reference
voltage, VREFIO, and external resistors, IRSET and QRSET, respec-
tively. IIOUTFS and IQOUTFS can be expressed as follows:
IIOUTFS = 32 × IIREF
(3)
IQOUTFS = 32 × IQREF
where:
IIREF = VREFIO/IRSET
(4)
IQREF = VREFIO/QRSET
or
IIOUTFS = 32 × VREFIO/IRSET
(5)
IQOUTFS = 32 × VREFIO/QRSET
A differential pair (IOUTP/IOUTN or QOUTP/QOUTN)
typically drives a resistive load directly or via a transformer. If
dc coupling is required, the differential pair (IOUTP/IOUTN or
QOUTP/QOUTN) should be connected to matching resistive
loads, xRLOAD, that are tied to analog common, AVSS. The
single-ended voltage output appearing at the positive and
negative nodes is
VIOUTP = IOUTP × IRLOAD
(6)
VQOUTP = QOUTP × QRLOAD
VIOUTN = IOUTN × IRLOAD
(7)
VQOUTN = QOUTN × QRLOAD
To achieve the maximum output compliance of 1 V at the
nominal 4 mA output current, IRLOAD = QRLOAD must be set
to 250 Ω.
Substituting the values of IOUTP, IOUTN, and IxREF, VIDIFF can
be expressed as
VIDIFF = {(2 × IDAC CODE – (2N 1))/2N} ×
(8)
(32 × VREFIO/IRSET) × IRLOAD
Equation 8 highlights some of the advantages of operating the
AD9714/AD9715/AD9716/AD9717 differentially. First, the
differential operation helps cancel common-mode error sources
associated with IOUTP and IOUTN, such as noise, distortion,
and dc offsets. Second, the differential code-dependent current and
subsequent voltage, VIDIFF, is twice the value of the single-ended
voltage output (that is, VIOUTP or VIOUTN), thus providing twice
the signal power to the load. Note that the gain drift temperature
performance for a single-ended output (VIOUTP and VIOUTN) or
differential output (VIDIFF) of the AD9714/AD9715/AD9716/
AD9717 can be enhanced by selecting temperature-tracking
resistors for xRLOAD and xRSET because of their ratiometric
relationship, as shown in Equation 8.
ANALOG OUTPUT
The complementary current outputs in each DAC, IOUTP/
IOUTN and QOUTP/QOUTN, can be configured for single-
ended or differential operation. IOUTP/IOUTN and QOUTP/
QOUTN can be converted into complementary single-ended
voltage outputs, VIOUTP and VIOUTN, as well as VQOUTP and VQOUTN
Function section by Equation 6 through Equation 8. The differen-
tial voltages, VIDIFF and VQDIFF, existing between VIOUTP and VIOUTN,
and VQOUTP and VQOUTN, can also be converted to a single-ended
voltage via a transformer or a differential amplifier configuration.
The ac performance of the AD9714/AD9715/AD9716/AD9717
is optimum and is specified using a differential transformer-
coupled output in which the voltage swing at IOUTP and IOUTN
is limited to ±0.5 V. The distortion and noise performance of
the AD9714/AD9715/AD9716/AD9717 can be enhanced when
it is configured for differential operation. The common-mode
error sources of both IOUTP/IOUTN and QOUTP/QOUTN
can be significantly reduced by the common-mode rejection
of a transformer or differential amplifier. These common-mode
error sources include even-order distortion products and noise.
The enhancement in distortion performance becomes more
significant as the frequency content of the reconstructed wave-
form increases and/or its amplitude increases. This is due to
the first-order cancellation of various dynamic common-mode
distortion mechanisms, digital feedthrough, and noise. Performing
a differential-to-single-ended conversion via a transformer also
provides the ability to deliver twice the reconstructed signal
power to the load (assuming no source termination). Because
the output currents of IOUTP/IOUTN and QOUTP/QOUTN
are complementary, they become additive when processed
differentially.
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相关代理商/技术参数 |
参数描述 |
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| AD9714-EBZ | 制造商:Analog Devices 功能描述:DUAL 8 BIT LOW POWER CONVERTER - Boxed Product (Development Kits) |
| AD9715 | 制造商:AD 制造商全称:Analog Devices 功能描述:Dual, 8-/10-/12-/14-Bit Low Power Digital-to-Analog Converters |
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| AD9715-DPG2-EBZ | 功能描述:ADC 12BIT DUAL 40LFCSP RoHS:是 类别:编程器，开发系统 >> 评估板 - 数模转换器 (DAC) 系列:TxDAC® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- DAC 的数量:4 位数:12 采样率（每秒）:- 数据接口:串行，SPI? 设置时间:3µs DAC 型:电流/电压 工作温度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
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